〔主要な業績〕側鎖にカルボキシル基を有するポリイミドへの酸化チタンの添加効果　　　　　　　　　　　　　　　
程塚結葵,森川敦司, 責任著者, ポリイミド・芳香族系高分子 最近の進歩 2023,第30回 日本ポリイミド・芳香族系高分子会議 会議録
ポリイミド・芳香族系高分子 最近の進歩 2023 第30回日本ポリイミド・芳香族系高分子会議会議録, 2023年06月30日

〔主要な業績〕Preparation of Polyimide-TiO2 Hybrid Films by Synthesis of Polyamic Acid Having Carboxylic Acid Group Sidechains in the Presence of TiO2　　　　　　　　　　　　　　　
Yuuki Hodozuka and Atsushi Morikawa, 責任著者, THE SOCIETY OF PHOTOPOLYMER SCIENCE AND THECHNOLOGY
Journal of Photopolymer Science and Thechnology, 2023年06月, ［査読有り］

ゾルーゲル法によるシリカ含有絶縁エナメル線の作製とその絶縁特性　　　　　　　　　　　　　　　
森川敦司, シーエムシー出版
機能材料, 2022年06月07日

Thermal Conversion of Polyamic Acid Gel to Polyimide Solution Having Amino Group Sidechains　　　　　　　　　　　　　　　
Journal of Photopolymer Science and Technology, 2021年06月01日, ［査読有り］

Synthesis and Properties of Polyimides from bis[4-(Aminophenoxy)phenyl] ether and Aromatic Dianhydrides Having Various Numbers of Phenylene Units　　　　　　　　　　　　　　　
筆頭著者, Journal of Photopolymer Science and Technology
Journal of Photopolymer Science and Technology, 2020年05月, ［査読有り］

Preparation and Properties of Rigid Polyimides from Dianhydrides Having Various Number of Phenylene Units and p-Phenylenediamine　　　　　　　　　　　　　　　
ラスト(シニア)オーサー, Journal of Photopolymer Science and Technology
Journal of Photopolymer Science and Technology, 2019年06月, ［査読有り］

Synthesis and Properties of Polyimides from Aromatic Dianhydrides Having Various Number of Phenylene Units and Bis {4-[4-(4-aminophenoxy)phenoxy]phenyl}ether　　　　　　　　　　　　　　　
責任著者, Journal of Photopolymer Science and Technology
Journal of Photopolymer Science and Technology, 2019年06月, ［査読有り］

Preparation and Properties of Crosslinking Polyimides Having Ethynyl Groups on the Side
Morikawa Atsushi; Sugaya Norihiro, 筆頭著者, 3,5-Diamino-4'-ethynylbenzanilide (1) was synthesized from 4-ethynylaniline and 3,5-dinitrobenzoyl chloride. Polyimides (PI-x) having ethynyl groups on the side were prepared from 1, 4,4'-oxydianiline (ODA), and various dianhydrides (x) by the usual two-step procedure that included ring-opening polymerization leading to polyamic acid (PAA-x) and subsequent thermal cyclic dehydration. Since gelation was observed in the polymerization of PAA-c from 3,3'4,4'-benzophenonetetracarboxylic dianhydride (BTDA) (c), the polymerization was performed in the dark. In the dynamic mechanical analysis of PI-x, glass transition temperatures (T_g) were observed at 262-320 ^oC as tan δ peak temperatures, and the values were higher due to crosslinking of ethynyl groups at 360 ^oC. T_g of the film prepared from PAA-c solution exposed to a fluorescent lamp was higher than that of a PI-c film prepared in the dark, and photo-crosslinking of ethynyl groups was also observed., Journal of Photopolymer Science and Technology
Journal of Photopolymer Science and Technology, 2017年06月, ［査読有り］

High Performance Polymers　　　　　　　　　　　　　　　
Preparation of Poly(ether ketone)s having phenyl, biphenyl, and terphenyl side groups and comparison of their properties
2016年12月, ［査読有り］

Preparation of poly(ether ketone)s having phenyl, biphenyl, and terphenyl side groups and comparison of their properties　　　　　　　　　　　　　　　
High Performance Polymers
High Performance Polymers, 2016年12月, ［査読有り］

Preparation of Poly(amide-imide)-silica Hybrid Materials by Sol-Gel Process　　　　　　　　　　　　　　　
筆頭著者
Journal of Photopolymer Science and Technology, 2016年06月, ［査読有り］

Synthesis and properties of polyimides having a hexaphenylbenzene unit
Syuta Nabeshima; Atsushi Morikawa, Aromatic polyimides (PIs) with a hexaphenylbenzene unit were synthesized from 1,4-bis[4-(4-aminophenoxy)phenyl]-2,3,5,6-tetraphenylbenzene (1) and various tetracarboxylic dianhydrides by a conventional two-step procedure that included ring-opening polymerization in N-methyl-2-pyrrolidone and subsequent thermal cyclic dehydration. The PIs were characterized by X-ray diffraction, differential scanning calorimetry, thermogravimetry, and dynamic mechanical analysis. The PIs had glass transition temperatures in the range of 289-352 degrees C, and all the polymers were amorphous. The structure-property relationships of these PIs were examined and compared with those of the previously prepared analogous PIs from 4,4-bis(4-aminophenoxy)biphenyl (2) and 4,4-bis(4-amino-2-phenylphenoxy)biphenyl (3). Water absorption and dielectric constants of the PIs were also compared and discussed on the basis of imide content per repeating unit., SAGE PUBLICATIONS LTD
High Performance Polymers, 2015年09月15日, ［査読有り］

Enameled Wire Having Polyimide-silica Hybrid Insulation Layer Prepared by Sol-gel Process
Atsushi Morikawa; Kazunori Suzuki; and Kenji Asano, Heat resistant enameled wire that possessed a polyimide-silica hybrid insulation layer prepared using the sol-gel process was prepared. Tetraethoxysilane (TEOS) was hydrolyzed, followed by polycondensation in polyamic acid varnish, and the varnish was then used as an enamel. Conductor wire was coated with the enamel through a die to control the coating thickness. The wire was then passed through an oven for solvent evaporation and imidation. Interconnected uniform silica globules with a diameter of 50 nm were observed in the insulation layer by scanning electron microscopy (SEM). The enameled wire showed higher breakdown voltage than that without silica after thermal deterioration at 300 degrees C or 400 degrees C., TECHNICAL ASSOC PHOTOPOLYMERS,JAPAN
Journal of Photopolymer Science and Technology, 2015年06月20日, ［査読有り］

Preparation of Nanopatterned Polyimide by Imprinting and Curing Phenylethynyl- terminated Imide Oligomer
Masahiko Ogino; Tatsuya Ohhashi; Hirofumi Yoshida; Daigo Nagayama; Toshio Kubota; Atsushi Morikawa; Katsumich Ono, Addition-type phenylethynyl-terminated imide oligomers were synthesized from 4,4'-diaminodiphenyl ether(ODA), 4-phenylethynylphthalic anhydride (PEPA) and 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) or 4,4'-hexafluoroisopropylidene)-dianhydrid (6FDA), and preparation of nanopatterned polyimide was examined by imprinting the melted phenylethynyl-terminated imide oligomer and crosslinking the ethynyl groups. Crosslinked polyimide films were prepared by pressing the melted phenylethynyl-terminated imide oligomers and curing them under pressure at 370 degrees C afterward, and the properties of the polyimide films were studied for comparison. The crosslnked polyimide films had high glass transition temperature (Tg) above 320 degrees C, and showed excellent tensile strength more than 100 MPa. Nanopatterned polyimide was prepared by imprinting the melted imide oligomer with a metal mold and curing it under pressure at 370 degrees C afterward. ZEONOR (R) film could be imprinted using the imprinted and cured imide oligomer as sub-mold instead of the metal mold., TECHNICAL ASSOC PHOTOPOLYMERS,JAPAN
Journal of Photopolymer Science and Technology, 2014年06月25日, ［査読有り］

Synthesis and characterization of novel aromatic polyimides from Z-type sexiphenyltetracarboxylic dianhydride and aromatic diamines
Takafumi Nakagawa; Atsushi Morikawa, A Z-type sexiphenyltetracarboxylic dianhydride, 3,3″″′,4, 4″″′-1,1′:2′,1″:4″,1″′: 4″′,1″″:2″″,1″″′- sexiphenyltetracarboxylic dianhydride (1), was synthesized in seven steps from diethyl 4-bromophthalate. New aromatic polyimides (PI1x) containing the Z-type sexiphenyl unit were synthesized from 1 and various aromatic diamines (x) by both conventional two- and one-step procedures. The inherent viscosities of PI1x produced by the one-step procedure were 0.23-1.21, which is much higher than those of the polyimides produced by the two-step procedure. The polyimides PI1x were characterized by X-ray diffraction, differential scanning calorimetry, thermogravimetry and dynamic mechanical analysis (DMA). The structure-property relationships of the polyimides PI1x were compared with those of the polyimides (PI2x) previously prepared from rigid 3,3″″′, 4,4″″′-p-sexiphenyltetracarboxylic dianhydride (2), which is an isomer of 1. The glass transition (Tg) temperatures were much higher (270-345 °C) than those of the corresponding PI2x, and the decrease in the storage modulus at Tg was larger than that of the corresponding PI2x. The polyimides PI1x showed lower dielectric constants (ε) and were soluble in polar organic solvents at room or elevated temperature in contrast with PI2x. The Z-type structure significantly influences the properties of polyimides containing sexiphenylene units. © 2014 The Society of Polymer Science, Japan (SPSJ)., Society of Polymer Science
Polymer Journal, 2014年05月15日, ［査読有り］

Synthesis and properties of conjugated polymers from 3,6-di(4-chlorophenyl)-3,6-dihydrophthalic acid diethyl ester and application to the photo-sensitizer of a solar cell
Atsushi Morikawa and Hirotoshi Kakuta, Ni(0)-catalyzed coupling polymerizations of 3,6-di(4-chlorophenyl)-3,6-dihydrophthalic acid diethyl ester 1 were accompanied by isomerization of the 1,4-cyclohexadiene moiety into a 3,5-cyclohexadiene group, yielding a conjugated polymer. The structure of this conjugated polymer was the same as that of the conjugated polymer from 3,6-di(4-chlorophenyl)-1,2-dihydrophthalic acid diethyl ester 2. The number-average degree of polymerization was only similar to 7 due to the low solubility of the conjugated polymer. The conjugated polymer exhibited a lambda max at 430 nm in the absorption spectrum, and could be applied as a photo-sensitizer of a solar cell. The incident monochromatic photon (450 nm)-to-current conversion efficiencies of photocurrent from an indium-titanium oxide (ITO)/TiO2 electrode modified with the conjugated polymer was 6.1% in the I3(-)-3I(-) electrolyte wet system. The conjugated polymer exhibited a glass transition temperature of 210 degrees C and was converted by thermal treatment at 300 degrees C to poly(p-phenylene) (PPP) with the elimination of ethoxycarbonyl groups., NATURE PUBLISHING GROUP
Polymer Journal, 2013年08月15日, ［査読有り］

Hyperbranched poly(ether ether ketone)s: preparation and comparison of properties with the corresponding dendrimers
Atsushi Morikawa and Minoru Akagi, Hyperbranched poly(ether ether ketone)s with hydroxyl terminal groups are prepared by a one-step polycondensation of 3,5-dihydroxy-4'-(4-fluorobenzoyl)diphenylether (AB(2)-type monomer) through an aromatic nucleophilic substitution reaction. With the help of model compounds, H-1-NMR studies reveal that the degree of branching of the poly(ether ether ketone)s is about 52%. The possibility of entanglement among the hyperbranched polymer molecules is suggested from comparison of their glass transition temperatures with the corresponding dendrimers and the optimized structure of the hyperbranched polymers. The terminal hydroxyl groups were readily functionalized, yielding hyperbranched polymers with a variety of different functional chain ends. The nature of the chain end is shown to dramatically affect the properties of the hyperbranched polymers., NATURE PUBLISHING GROUP
Polymer Journal, 2013年06月15日, ［査読有り］

Synthesis and Characterization of Polyimide from 4,4'-Diamino diphenyl ether having Substituents at 2, 2'-position
A. Morikawa; Shyuta Nabeshima; Arata Satoh; Yukari Moriyama, Aromatic polyimides having phenyl groups and trifluoromethyl groups at 2,2'-position of the diphenyl ether moieties have been prepared from bis(4-amino-2-biphenyl)ether (1) and bis(4-amino-2-trifluoromethylphenyl)ether (2), respectively and various tetracarboxylic dianhydrides by the conventional two-step procedure. The substituents at 2,2'-position of the diphenyl ether had a great influence on the properties of polyimides. In this paper, aromatic polyimises having only one phenyl group at 2,2'-position of the diphenyl ether moieties are prepared from 4,4'-diamino-2-phenyldiphenylether (3), and the properties are compared with those of the polyimides from 1 and 2. © 2013SPST.
Journal of Photopolymer Svience and Technology, 2013年05月10日, ［査読有り］

Synthesis and properties of polyimides from 1,4-bis(4-amino-2-phenylphenoxy)benzene and 4,4'-bis(4-amino-2-phenylphenoxy)biphenyl　　　　　　　　　　　　　　　
Atsushi Morikawa; Fumi Miyata; Jun Nishimura
High Performance Polymers, 2012年11月08日, ［査読有り］

Preparation and properties of polyimides-silica hybrid films with conjugation of the polyimide and silica by a sol-gel process using 3-(triethoxysilyl)propyl succinic anhydride
Yoshikatsu Shiina; Atsushi Morikawa, New polyimide-silica hybrid materials were prepared using the polyamic acid synthesized by copolymerization of 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA), 4,4'-oxydianiline (ODA) and an A(2)A'-type tri-functional amine, 1,1-bis(4-(aminophenoxy)phenyl)-1-(4-(4-amino-2-trifluoromethylphenoxy)phenyl)ethane (1) (BTDA:ODA:1 = 7:6:1 in the molar). 3-(Triethoxysilyl)propyl succinic anhydride(TESSA) was reacted with amino groups in polyamic acid to introduce ethoxysilyl moiety which act as conjugation site for silica. The polyimide-silica hybrid films were prepared by a sol-gel reaction of tetraethoxysilane (TEOS) in a solution of the polyamic acid, followed by thermal imidation. Self-standing films were obtained with up to 50 wt.% silica, and transparent films were obtained at up to 40 wt.% silica. Dynamic-mechanical and mechanical analyses were carried out to examine the properties of hybrid films. (C) 2010 Elsevier Ltd. All rights reserved., ELSEVIER SCIENCE BV
Reactive and Functional Polymers, 2011年, ［査読有り］

Synthesis and Characterization of Aromatic Polyimides containing trifluoromethyl group from Bis(4-amino-2-trifluoromethylphenyl)ether and Aromatic Tetracarboxylic Dianhydrides
Arata Satoh; Atsushi Morikawa, Aromatic polyimides, which had trifluoromethyl group at 2,2'-position of the diphenyl ether, were synthesized from bis(4-amino-2-trifluoromethylphenyl) ether (1) and previously prepared tetracarboxylic dianhydrides, 3,3''',4,4'''-p-quaterphenyltetracarboxylic dianhydride (2d), 3,3''''',4,4'''''-p-quinquephenyltetracarboxylic dianhydride (2e) and 3,3''''',4,4'''''-p-sexiphenyltetracarboxylic dianhydride (2f), and the properties were compared than those of corresponding polyimides from commercially available tetracarboxylic dianhydrides. The polyimides were synthesized by the conventional two-step procedure of ring-opening polyaddition in N-methyl-2-pyrrolidinone (NMP) and subsequent thermal cyclic dehydration. The polyimides were characterized by differential scanning calorimetry (DSC), thermogravimetry, and dynamic mechanical analysis (DMA). The polyimides showed excellent thermal stability, and had glass transition temperature (T(g)) at 234-300 degrees C. The properties of polyimides were compared with those of previously prepared polyimides, which had phenyl group at 2,2'-position of the diphenyl ether, and the effect of the trifluoromethyl groups at the 2, 2'-positions of the diphenyl ether were observed in the thermal properties, solubility and optical properties of polyimides., SAGE PUBLICATIONS LTD
High Performance Polymers, 2010年06月15日, ［査読有り］

Synthesis and Characterization of Novel Polyimides from 1,1-bis[4-(4-aminophenoxy)phenyl]-1-(4-hydroxyphenyl)ethane
Takahiro Okabe; Atsushi Morikawa, A new diamine, 1,1-bis[4-(4-aminophenoxy)phenyl]-1-(4-hydroxyphenyl)ethane, was synthesized in three steps starting from 1,1,1-tris(4-hydroxyphenyl)ethane. New aromatic polyimides having hydroxy side groups were prepared from this diamine and various tetracarboxylic dianhydrides by the conventional two-step procedure that included ring-opening polymerization in N-methyl-2-pyrrolidone (NMP) and subsequent thermal cyclic dehydration. The polyimides were characterized by X-ray diffraction, differential scanning calorimetry (DSC), thermogravimetry (TG), and dynamic mechanical analysis (DMA). All the polyimides were amorphous, and had glass transition temperature (T(g)) in the range of 232-304 degrees C. The properties of polyimides were compared with those of polyimides prepared from 1,1-bis[4-(4-aminophenoxy)phenyl]-1-phenylethane, which had no hydroxy side groups. The effects of the hydroxy side groups were observed in the thermal properties, thermal mechanical properties and solubility of polyimides., SAGE PUBLICATIONS LTD
High Performance Polymers, 2010年, ［査読有り］

Synthesis and characterization of sulfonated polyimides derived from 2,2’-bis(4-sulfophenyl)oxydianiline as polymer electrolyte membranes for fuel cell applications
Zhaoxia Hu; Yan Yin; Ken-ichi Okamoto; Yukari Moriyama; Atsushi Morikawa, A novel sulfonated diamine bearing aromatic sulfophenyl pendant groups, named as, 2,2'-bis(4-sulfophenyl)-4,4'-oxydianiline (SPhODA) was synthesized. Sulfonated (co)polyimides (SPIs) with flexible ether linkage in the main chain and sulfopheryl groups in the side chain were synthesized from SPhODA, 1,4,5,8-naphthalene tetracarboxylic dianhydride and nonsulfonated diamines. The SPI membranes showed good solubility in common aprotic solvents and high desulfonation temperature of 320 degrees C. The SPIs with ion exchange capacities of 1.57-2.50 meq g(-1) displayed reasonably high proton conductivities of 0.09-0.21 Scm(-1) at 60 degrees C in water and 0.02-0.05 Scm(-1) at 70% relative humidity. They also displayed high mechanical properties, but their water stability was not enough high at high temperatures. They showed high potential for DMFC application at low and/or mediate temperatures. (c) 2009 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Membrane Science, 2009年, ［査読有り］

Synthesis of Polyimides 3,3’-dihydroxybenzidine and Conversion to Polybenzoxazoles
Takahiro Okabe; Atsushi Morikawa, The polyimides containing the hydroxy group were synthesized from 3,3'- dihydroxybenzidine (I) and previously prepared tetracarboxylic dianhydrides, 3,3"', 4,4"'-p-quaterphenyltetracarboxylic dianhydride (IId), 3,3 '''',4,4 ''''-p- quinquephenyltetracarboxylic dianhydride (IIe) and 3,3 '''',4,4 ''''-p-sexiphenyltetracarboxylic dianhydride (IIf), and the properties were compared with those of corresponding polyimides from commercially available dianhydrides. The polyimides were synthesized by the conventional two-step procedure of ring-opening polyaddition in N-methyl-2-pyrrolidinone (NMP) and subsequent thermal cyclic dehydration. All the polyimides were soluble in NMP on heating. The glass transition temperature (T(g)) of the polyimides ranged from 336-360 degrees C, and were not dependent on the structure of tetracarboxylic dianhydride. The storage modulus of some polyimides did not decrease at high temperature. All the polyimides underwent thermal conversion to polybenzoxazoles upon heating to 500 degrees C for 1 h under vacuum. The thermal conversion of the polyimides to polybenzoxazoles was confirmed by Fourier transform infrared spectrometry. The 10% weight loss temperature (T(10)) of the polybenzoxazoles was 530-700 degrees C in nitrogen, and the polybenzoxazoles were thermally stable. In particular, the T10 values of the polybenzoxazoles from IId, IIe, and IIf were above 630 degrees C., SAGE PUBLICATIONS LTD
High Performance Polymers, 2008年, ［査読有り］

Synthesis and Characterization of Novel Aromatic Polyimides from Bis(4-amino-2-biphenyl)ether and Aromatic Tetracarboxylic Dianhydrides
Atsushi Morikawa; Taka-aki Furukawa; Yukari Moriyama, Aromatic polyimides having phenyl groups at the 2- and 2'-positions of the diphenyl ether moiety were synthesized from bis(4-amino-2-biphenyl) ether and various tetracarboxylic dianhydrides by the conventional two-step procedure using N-methyl-2-pyrrolidone (NMP) as a solvent [Morikawa et at., Polymer Journal 37, 759, 2005]. The phenyl groups at the 2,2'-position of the phenyl ether improved the solubility of polyimides without decreasing the thermal and thermo-mechanical properties. In this paper, soluble polyimides were synthesized in a one-step procedure by reacting this diamine with various tetracarboxylic dianhydrides in m-cresol at 190 degrees C, and the properties,, especially the thermal properties, thermo-mechanical properties and solubility were compared with those of the polyimides synthesized by the two-step procedure., SAGE PUBLICATIONS LTD
High Performance Polymers, 2006年

Synthesis and Characterization of Novel Aromatic Polyimides from Bis(4-amino-2-biphenyl)ether and Aromatic Tetracarboxylic Dianhydrides
Atshushi Morikawa; Taka-aki; Furukawa; Yukari Moriyama, A new phenylated diamine, bis(4-amino-2-biphenyl)ether, was synthesized in five steps starting from 3-chloro-4-fluoronitrobenzene. New aromatic polyimides having phenyl groups at the 2- and T-positions of the diphenyl ether moiety were prepared from this diamine and various tetracarboxylic dianhydrides by the conventional two-step procedure that included ring-opening polymerization in NMP and subsequent thermal cyclic dehydration. The polyimides were characterized by differential scanning calorimetry (DSC), thermogravimetry, and dynamic mechanical analysis (DMA). Typical polyimides showed excellent thermal stability, and had glass transition temperature (T-g) above 250 degrees C. As for the series of polyimides prepared from tetracarboxylic anhydrides having linear phenylene moiety, the introduction of phenyl group at the 2- and T-positions of phenyl ether improved thermal and thermo-mechanical properties as well as the solubility of polymers., SOC POLYMER SCIENCE JAPAN
Polymer Journal, 2005年, ［査読有り］

Synthesis and Characterization of Novel Aromatic Polyimides from Aromatic Diamine and 3,3'''',4,4''''-p-Quinquephenyltetracarboxilic Dianhydride
Atsushi Morikawa; Yusuke Hosoya, A new rigid tetracarboxylic dianhydride, 3,3""4,4""-p-quinquephenyltetracarboxylic dianhydride, was synthesized in seven steps starting from diethyl 4-bromophthalate. New aromatic polyimides containing a p-quinquephenyl unit were synthesized from this tetracarboxylic dianhydride and various aromatic diamines by the conventional two-step procedure of ring-opening polyaddition in a polar amide-type solvent and subsequent thermal cyclic dehydration. These polyimides had inherent viscosities of 0.20-1.20dL g(-1), and were insoluble in organic solvents. The polyimides were characterized by differential scanning calorimetry (DSC), thermogravimetry (TG), wide-angle X-Ray diffraction measurements, and dynamic mechanical analysis (DMA). Typical polyimides had glass transition temperatures (T-g) at about 250 degreesC, and crystallized above T(g)s. The effects of p-quinquephenyl Structure were reflected in the high storage modulus above the glass transition temperature., NATURE PUBLISHING GROUP
The Society of Polymer Science, Japan, 2002年07月01日

Aromatic polyimides containing p-quaterphenyl and p-sexiphenyl units
Atshushi Morikawa; Katsumichi Ono, These polyimides are characterized by having long phenylene units and the introduction of these has a strong influence on the properties of polyimides. In this paper, the properties of polyimides are compared with those of polyimides from 3,3 "/,4,4 " -p-terphenyltetracarboxylic dianhydride (m = 1) and 3,3 ' ,4,4 ' -biphenyltettacarboxylic dianhydride (m = 0), which had been previously prepared, and discussed on the basis of the number (m) of phenylene units in the dianhydrides., IOP PUBLISHING LTD
High Performance Polymers, 2001年

Preparation of Poly(ether ether ketone) Dendrimers by the Divergent Method
Atsushi Morikawa; Katsumichi Ono, New highly branched poly[ (ether)-(ether ether ketone)] dendrimers were synthesized by the convergent approach using two building blocks, 3, 5-dihydroxybenzyl alcohol, 1, and 3, 5-dihydroxy-4'-(4-fluorobenzoyl)diphenylether, 2, alternatively. The reaction of p-fluorobenzonitrile and 1 gave 3, 5-di(4-cyanophenoxy)benzylalcohol (the first generation dendron, G 1-OH). After G 1-OH was converted to 3, 5-di(4-cyanophenoxy)benzylbromide (G 1-Br), the resultant benzylic bromide functionality was allowed to react with 2 to yield the second-generation dendron (G 2-F). The third-generation dendron (G 3-OH) was obtained by the reaction of G 2-F and 1, and the fourth-generation dendron (G 4-F) was obtained by reaction of G 3-Br derived from G 3-OH, with 2. Finally, dendrimers, Den(G 2), and Den-(G 4)(3) were synthesized by reaction of G 2-F and G 4-F with trifunctional core, respectively. Analysis was made of these structurally unambiguous dendrons and dendrimers by gel permeation chromatography (GPC) and matrix-assisted laser desorption ionization time of flight (MALDI-TOF) mass spectroscopy. H-1 and C-13 NMR spectra were consistent with the structures of these dendrons and dendrimers., SOC POLYMER SCIENCE JAPAN
Polymer Journal, 2000年, ［査読有り］

Preparation of Poly［(ether)-(ether ether ketone)］ Dendrimers by the Convergent Method
Atshushi Morikawa; Katsumichi Ono, New highly branched poly[ (ether)-(ether ether ketone)] dendrimers were synthesized by the convergent approach using two building blocks, 3, 5-dihydroxybenzyl alcohol, 1, and 3, 5-dihydroxy-4'-(4-fluorobenzoyl)diphenylether, 2, alternatively. The reaction of p-fluorobenzonitrile and 1 gave 3, 5-di(4-cyanophenoxy)benzylalcohol (the first generation dendron, G 1-OH). After G 1-OH was converted to 3, 5-di(4-cyanophenoxy)benzylbromide (G 1-Br), the resultant benzylic bromide functionality was allowed to react with 2 to yield the second-generation dendron (G 2-F). The third-generation dendron (G 3-OH) was obtained by the reaction of G 2-F and 1, and the fourth-generation dendron (G 4-F) was obtained by reaction of G 3-Br derived from G 3-OH, with 2. Finally, dendrimers, Den(G 2), and Den-(G 4)(3) were synthesized by reaction of G 2-F and G 4-F with trifunctional core, respectively. Analysis was made of these structurally unambiguous dendrons and dendrimers by gel permeation chromatography (GPC) and matrix-assisted laser desorption ionization time of flight (MALDI-TOF) mass spectroscopy. H-1 and C-13 NMR spectra were consistent with the structures of these dendrons and dendrimers., SOC POLYMER SCIENCE JAPAN
Polymer Journal, 2000年, ［査読有り］

Synthesis and Characterization of Novel Aromatic Polyimides from Aromatic Diamine and 3,3''',4,4'''-p-Quaterphenyltetracarboxilic Dianhydride
Atshushi Morikawa, A new rigid tetracarboxylic dianhydride, 3,3''',4,4'''-p-quarterphenyltetracarboxylic dianhydride, was synthesized in three steps starting from diethyl 4-bromophthalate. New aromatic polyimides containing a p-quarterphenyl unit were synthesized from this tetracarboxylic dianhydride and various aromatic diamines by the conventional two-step procedure that included ring-opening polyaddition in a polar amide-type solvent and subsequent thermal cyclic dehydration. These polyimides had inherent viscosities of 0.41-0.83 dl g(-1), and were insoluble in organic solvents. The glass transition temperatures (T-g) of the polyimides were 220-260 degrees C, and exothermic crystallization was observed on heating above its T-g. Almost all the polyimides underwent melting prior to its decomposition., SOC POLYMER SCIENCE JAPAN
Polymer Journal, 2000年

Synthesis and Characterization of Novel Aromatic Polyimides from Aromatic Diamine and 3,3''''',4,4'''''-p-Sexiphenyltetracarboxilic Dianhydride
Atsushi Morikawa; Katsumichi Ono, A new rigid tetracarboxylic dianhydride, 3,3""', 4,4""'-p-sexiphenyltetracarboxylic dianhydride, was synthesized in seven steps starting from diethyl 4-bromophthalate, New aromatic polyimides containing a p-sexiphenyl unit were synthesized from this tetracarboxylic dianhydride and various aromatic diamines by the conventional two-step procedure of ring-opening polyaddition in a polar amide-type solvent and subsequent thermal cyclic dehydration. These polyimides had inherent viscosities of 1.20-1.69 dL g(-1), and were insoluble in organic solvents. The polyimides were characterized by differential scanning calorimetry (DSC), thermogravimetry (TG), wide-angle X-Ray diffraction measurements, and dynamic mechanical analysis (DMA). Typical polyimides were noncrystalline and showed excellent thermal stability, and had glass transition temperatures (T(g)) at about 250 degreesC. Decrease in the modulus at the glass transition temperature was less than corresponding polyimides having no p-sexiphenyl unit due to the presence of the rigid p-sexiphenyl unit., NATURE PUBLISHING GROUP
Polymer Journal, 2000年

Preparation of Poly(ether ketone) Dendrons with Graded Structures
Atsushi Morikawa; Katsumichi Ono, New highly branched poly(ether ketone) dendrons, with graded structures, were synthesized by the convergent approach using aromatic nucleophilic substitution reactions. Four kinds of compounds-3,5-bis(4-fluorobenzoyl)anisole, 1; 4-methoxy-3',5'-bis(4-fluorobenzoyl)-biphenyl 2; 4-methoxy-3 ",5'''-bis(4-fluorobenzoyl)-p-terphenyl, 3; and 4-methoxy-3''',5'''-bis(4-fluorobenzoyl)-p-quaterphenyl, 4-(numberedin the order of the phenylene length) were used as the building blocks, where the methoxy groups were, the protected form of hydroxy groups. The reactions of 1 with phenol gave the first generation dendron, G1. Next;, after the methoxy group of G1 was converted to the hydroxy derivative, G1-OH by the reaction with aluminum chloride, the resultant phenol functionality of G1-OH was allowed to react with 2 to yield, the second generation dendron: G2 By repeating the procedure, further generations G3 and G4, were prepared using 3 and 4 as the building block, respectively. The H-1 and C-13 NMR spectra were consistent with the structure of these dendrons, The molecular weight and molecular weight distribution determined by gel permeation chromatography indicated that the dendron posessed remarkably narrow molecular weight distribution after purification by silica gel chromatography. The analysis of these structurally unambiguous dendrons by matrix-assisted laser desorption ionization time of flight is described. The structure of the dendrons were demonstrated with a gradient of phenylene chain lengths from the periphery to the core., AMER CHEMICAL SOC
Macromolucules, 1999年, ［査読有り］

Synthesis and Characterization of Novel Aromatic Polyamides from 1,4-Bis(4-aminophenyl)-2,3-diphenylnaphthalene and Aromatic Dicarboxylic Acids
Atsushi Morikawa; Tadashi Hatakeyama, A new highly phenylated dia mine, 1,4-bis (4-aminophenyl)-2,3-diphenylnaphthalene, was synthesized in two steps starting from 2,5-bis(4-nitrophenyl)-3,4-diphenylcyclopentadienone. New aromatic polyamides containing tetraphenylnaphthalene unit were prepared by low temperature solution polycondensation of this diamine with various aromatic dicarboxylic acid chlorides. These polyamides had inherent viscosities of 0.45-0.82 dig(-1). Polyamides with m-phenylene moiety and flexible connecting group were soluble in various organic solvents such as N,N-dimethylacetamide and N-methyl-2-pyrrolidone, but those with rigid symmetric structures were soluble in only hot N,N-dimethylacetamide and N-methyl-2-pyrrolidone. The glass transition temperature of the polyamides ranged from 268 to 366 degrees C, and the 10% weight loss temperatures were above 500 degrees C in air., SOC POLYMER SCIENCE JAPAN
Polymer Journal, 1999年, ［査読有り］

Synthesis and Characterization of Novel Aromatic Polyimides from 1,4-Bis(4-aminophenyl)-2,3-diphenylnaphthalene and Aromatic Tetracarboxylic Dianhydrides
Atshushi Morikawa; Tadashi Hatakeyama, New aromatic polyimides containing a tetraphenylnaphthalene unit were synthesized from 1,4-bis(4-aminophenyl)-2,3-diphenylnaphthalene and various aromatic tetracarboxylic dianhydride by the conventional two-step procedure that included ring-opening polyaddition in a polar amide-type solvent and subsequent thermal cyclic dehydration. These polyimides had inherent viscosities of 0.58-1.01 dl g(-1) and some polyimides were readily soluble in a wide range of organic solvents such as N,N-dimethylacetamide, N-methyl-2-pyrrolidone, pyridine and m-cresol on heating. The glass transition temperature of the polyimides ranged from 306 to 375 degrees C, and 10% weight loss temperatures were 540-580 degrees C in air., SOC POLYMER SCIENCE JAPAN
Polymer Journal, 1999年, ［査読有り］

Preparation and Properties of Hyperbranched Poly(ether ketones) with a Various Number of Phenylene Units
Atsushi Morikawa, New AB(2) type monomers, with a various number of phenylene units, were prepared and converted to hyperbranched poly(ether ketones) by polymerization. Four kinds of AB(2) type monomers, 4-hydroxy-3',5'-bis(4-fluorobenzoyl)-biphenyl, 1, 4-hydroxy-3 ",5 " bis(4-fluorobenzoyl)-p-terphenyl, 2, 4-hydroxy-3 3''',5'''-bis(4-fluorobenzoyl)-o-quarterphenyl, 3, and 4-hydroxy-3'''',5''''-bis(4-fluorobenzoyl)-p-quinquephenyl, 4, were synthesized in a stepwise manner starting from 3,5-bis(4-fluorobenzoyl)phenol, 5, repeating a series of conversions of the hydroxy group to the triflate, cross-coupling reaction of the triflate with (p-methoxyphenyl)boronic acid, and cleavage of the methyl ether. Four kinds of hyperbranched poly(ether ketones) were prepared by the polymerization of the four AB(2) type monomers. Obtained hyperbranched poly(ether ketones) from 1 and 2 were soluble in various organic solvents including N-methyl-2-pyrrolidone, m-cresol, chloroform, and tetrahydrofuran, but those from 3 and 4 were insoluble in organic solvents. The thermal properties of these hyperbranched poly(ether ketones) depended on the number of the phenylene units. The values of the glass transition temperature increased with increasing number of the phenylene units, and only hyperbranched poly(ether ketone) from 5 showed crystalline character. The thermal properties of these hyperbranched poly(ether ketones) were compared with those of hyperbranched poly(ether ketones) having various numbers of phenylene units in the chain ends., AMER CHEMICAL SOC
Macromolecules, 1998年, ［査読有り］

Preparation and properties of optically active aromatic polyamides derived newly prepared chiral phenylindianediamine
Atsushi Morikawa; Masa-aki Kakimoto; Yoshio Imai
High Performance Polmers, 1995年, ［査読有り］

Preparation of aromatic polyimides from newly separated optically pure phenylindanedicarboxylic acid and their application to enantioseparation
Atsushi Morikawa; Masa-aki Kakimoto; Yoshio Imai
High Performance Polymers, 1994年, ［査読有り］

屈曲構造のセクシフェニルテトラカルボン酸二無水物からのポリイミドの合成とその性質
中川貴文、森川敦司
ポリイミド最近の進歩2006, 2006年

ビス［４－アミノ－２－（４－ヒドロキシ）フェニル］エーテルからのポリイミドの合成とその性質
岡部賢宏、森川敦司
ポリイミド最近の進歩2006, 2006年

ベンゾフェノンテトラカルボン酸二無水物の光反応性を利用したゾルーゲル法によるポリイミドーシルセスキオキサン複合体の作製
濱和夏菜、森川敦司
ポリイミド最近の進歩2006, 2006年

芳香族求電子置換反応を用いた枝分かれ多分岐ポリエーテルケトンの合成とその性質に関する研究
佐々木遼、森川敦司
ポリイミド最近の進歩2006, 2006年

ビス（４－アミノ－２－ビフェニル）エーテルからのポリイミドの合成とその性質
森川敦司、古川隆章、森山由香里
ポリイミド最近の進歩2005, 2005年

剛直な酸無水物と屈曲性のエーテル結合を有するジアミンからのポリイミド合成とその性質
森川敦司、細谷悠佑、梅澤敦彦
ポリイミド最近の進歩 2004, 2004年

剛直な主鎖をもつポリイミドの合成とその性質
森川敦司、細谷悠佑
ポリイミド最近の進歩 2003, 2003年

ゾルーゲル法によるポリイミドーシリカ複合体の作製とエネメル線絶縁層への応用　　　　　　　　　　　　　　　
森川敦司, 単著
（株）技術情報協会, 2022年08月31日
9784861048876

MATERIAL stage 2018年９月号　　　　　　　　　　　　　　　
森川敦司, 単著
（株）技術情報協会, 2018年08月

樹脂材料の高耐熱性化と設計・開発技術　　　　　　　　　　　　　　　
単著
情報機構, 2013年12月20日
9784865020502

ポリイミド材料の基礎と開発　　　　　　　　　　　　　　　
単著
シーエムシー出版, 2011年11月09日

High Performance Polymers and Enginerring Plastics　　　　　　　　　　　　　　　
Atsushi Morikawa, 単著
WILEY, 2011年

新訂 最新ポリイミド -基礎と応用-　　　　　　　　　　　　　　　
共著
日本ポリイミド・芳香族系高分子研究会編, ＮＴＳ, 2010年08月25日

最新ポリイミド材料と応用技術　　　　　　　　　　　　　　　
単著
シーエムシー出版, 2006年08月

側鎖にカルボキシル基を有するポリイミドへの酸化チタンの添加効果　　　　　　　　　　　　　　　
茨城大工・程塚結城〇森川敦司
第30回 日本ポリイミド・芳香族系高分子会議, 2022年12月10日
20221210

テトラフェニレン骨格を有するジアミンからのポリイミドの合成と，その性質のテトラフェニレン骨格を有する酸二無水物からのポリイミドとの比較
森川敦司
フォオポリマー学会, 2022年06月28日
20220628, 20220630

ヘキサフェニルベンゼン骨格を有するポリイミドの合成とその性質　　　　　　　　　　　　　　　
鍋島秀太 森川敦司
第21回日本ポリイミド･芳香族高分子会議, 2013年12月06日
20131206, 20131206

3,6-ジ(4-クロロフェニル)－３，６－ジヒドロフタル酸ジエチルエステルからの協約高分子の合成とその増感作用による太陽電池への応用　　　　　　　　　　　　　　　
森川敦司 角田博敏
第20回日本ポリイミド･芳香族高分子会議, 2012年12月07日

側鎖にアミノ基をゆうするポリイミドを用いたゾルーゲル法によるポリイミドーシリカ複合体の作製　　　　　　　　　　　　　　　
椎名美克 森川敦司
第19回日本ポリイミド･芳香族高分子会議, 2011年11月02日

ビス（4-アミノ-2-フェニルフェノキシ）構造を有するジアミンからのポリイミドの合成とその性質　　　　　　　　　　　　　　　
宮田文・西村淳○森川敦司
第17回日本ポリイミド・芳香族系高分子会議, 2009年10月16日

側鎖に水酸基を有するポリイミドの合成とその性質　　　　　　　　　　　　　　　
第16回日本ポリイミド・芳香族系高分子会議, 2008年12月

水酸基のエポキシ基への付加反応を利用したポリイミドシリカ複合体の作製とその性質　　　　　　　　　　　　　　　
第16回日本ポリイミド・芳香族系高分子会議, 2008年12月

Synthesis and Characterization of Aromatic Polyimides from Bis(4-amino-2-trifluoromethylphenyl)ether and Aromatic Tetracarboxylic Dianhydrides　　　　　　　　　　　　　　　
Polycondensation 2008, 2008年09月, Polycondensation 2008

側鎖に置換基を有するジアミンと剛直な酸無水物からのポリイミドの合成とその性質　　　　　　　　　　　　　　　
第15回日本ポリイミド・芳香族系高分子会議, 2007年11月

ピロメリットイミドの電子吸引性を利用したゾル-ゲル法によるポリイミド-ポリ（芳香族シルセスキオキサン）複合体の作製とその性質　　　　　　　　　　　　　　　
第14回日本ポリイミド・芳香族系高分子会議, 2006年09月

ベンゾフェノンテトラカルボン酸二無水物の光反応を利用したゾル-ゲル法によるポリイミド-ポリ（ｐ-トリルシルセスキオキサン）複合体の作製とその性質　　　　　　　　　　　　　　　
第14回日本ポリイミド・芳香族系高分子会議, 2006年09月

屈曲構造のセクシフェニルテトラカルボン酸二無水物からのポリイミドの合成とその性質　　　　　　　　　　　　　　　
第12回日本ポリイミド・芳香族系高分子会議, 2005年11月

ビス[4-アミノ-２－（４－ヒドロキシフェニル）フェニル]エーテルからのポリイミドの合成とその性質　　　　　　　　　　　　　　　
第13回日本ポリイミド・芳香族系高分子会議, 2005年11月

ベンゾフェノンテトラカルボン酸二無水物の光反応を利用したゾル-ゲル法によるポリイミド-ポリシルセスキオキサン複合体の作製とその性質　　　　　　　　　　　　　　　
第13回日本ポリイミド・芳香族系高分子会議, 2005年11月

芳香族求電子置換反応を用いた枝分かれ多分岐ポリエーテルケトンの合成とその性質に関する研究　　　　　　　　　　　　　　　
第13回日本ポリイミド・芳香族系高分子会議, 2005年11月

ビス（4-アミノ-２－フェニル）エーテルからのポリイミドの合成とその性質　　　　　　　　　　　　　　　
2004年11月

1997年04月, アメリカ化学会

1991年04月, 高分子学会