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Photopolymerization of Methyl Methacrylate with p-X-$C_{6}H_{4}SiH_{3}$ (X = F, $CH_3$, $OCH_3$)
우희권,김보혜,조명식,김대영,최영섭,곽영채,함희석,김동표,황택성,U, Hui Gwon,Kim, Bo Hye,Jo, Myeong Sik,Kim, Dae Yeong,Choe, Yeong Seop,Gwak, Yeong Chae,Ham, Hui Seok,Kim, Dong Pyo,Hwang, Taek Seong Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.12
The bulk photopolymerization of methyl methacrylate (MMA) with para-substituted phenylsilanes such as F-C6H4SiH3 (1), H3C-C6H4SiH3 (2), and H3CO-C6H4SiH3 (3) was performed to produce poly(MMA)s containing the respective silyl moiety as an end group. For all the hydrosilanes, the polymerization yields and the polymer molecular weights decreased, whereas the TGA residue yields and the relative intensities of Si-H IR stretching bands increased as the relative silane concentration over MMA increased. The polymerization yields and polymer molecular weights of MMA with 1-3 increased in the order of 3 < 1 < 2. These hydrosilanes influence significantly upon the photopolymerization of MMA as both chain-initiation and chain-transfer agents.
우희권,송선정,Woo, Hee Gweon,Song, Sun Jung 대한화학회 1997 대한화학회지 Vol.41 No.9
실란탈수소중합 반응을 위한 촉매들 및 중합반응 메카니즘들을 정리하여 기술하였다. 치환기 재분배 및 실란 소중합체를 생성하는 후기 전이금속 착물 촉매들과는 달리 전기 전이금속 착물 촉매들 특히 4족 전이금속 메탈로센계 촉매의 효과가 우수하였다. 4족 전이금속 메탈로센계 촉매의 효과를 극대화 하기위한 노력들을 소개하였으며, 또한 다양한 치환기를 갖는 실란고분자의 합성, 실란고분자 유도체의 합성, 탈수소중합 촉매의 세라믹 화학에의 응용예들을 기술 하였다. 마지막으로 실란의 탈수소중합법의 미래 전망을 살펴 보았다. This review deals with (1) the catalytic systems and mechanisms for the dehydropolymerization of silanes to polysilanes, (2) the dehydropolymerization of versatile silanes, (3) the preparation of polysilane derivatives, and (4) the applications of catalytic dehydropolymerizing systems to ceramics. The efforts to maximize the catalytic efficiency of group 4 metallocenes were introduced. Finally, the future of this dehydropolymerizing techniques of silanes was foreseen.
Acryloyllactam형 단량체의 공중합 및 그 공중합체를 이용한 음이온 그라프트 중합
우희권,최삼권,Hee G. Woo,Sam K. Choi 대한화학회 1982 대한화학회지 Vol.26 No.3
The copolymerization of N-acryloylpyrrolidone and acrylonitrile was performed in N,N'-dimethylformamide at 50$^{\circ}$C and monomer reactivity ratio was obtained by using IR working curve and Fineman and Ross equation. ($r_1$ = 0.43, $r_2$ = 1.56) It is found that resulting copolymer is good polymeric initiator for anionic graft copolymerization of 2-pyrrolidone. Graft copolymers with polybutylamide (nylon-4) grafts onto poly(NAP-Co-AN) backbone were synthesized and the various effects on the graft copolymerization of 2-pyrrolidone were examined. The rate constants ($K_p$) of graft anionic polymerization at 40 and 50$^{\circ}$C were 2.82${\times}$10 and 2.93${\times}$10(l/mole, min), respectively. N-acryloylpyrrolidone과 acrylonitrile을 혼성중합시켜 각 단위체의 반응성비를 구한 결과 생성되는 혼성중합체는 pyrrolidone이 음이온 중합에 매우 좋은 개시제임을 알 수 가 있었다. ($r_1$ = 0.43과 $r_2$ = 1.56) 그리고 그 혼성중합체를 개시제로 하여 그라프트된 nylon-4를 합성하여 중합속도 상수를 구했으며, 그에 따르는 여러 인자들의 효과를 관찰하였다. 그 결과 중합속도 상수로 40$^{\circ}$C에서 2.82${\times}10^3$(l/mole, min)와 50$^{\circ}$C에서 2.93${\times}10^3$(l/mole, min)을 얻었다.
Dehydrocoupling of Ethylene Disilanes Catalyzed by Group 4 Metallocene Combination
우희권,김보혜,조명식,송선정,한미경,김숙연,송아영,김정희,이재식,U, Hui Gwon,Kim, Bo Hye,Jo, Myeong Sik,Song, Seon Jeong,Han, Mi Gyeong,Kim, Suk Yeon,Song, A Yeong,Kim, Jeong Hui,Lee, Jae Sik Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.9
우희권,한미경,조은정,정일남,U, Hui Gwon,Han, Mi Gyeong,Jo, Eun Jeong,Jeong, Il Nam Korean Chemical Society 1995 Bulletin of the Korean Chemical Society Vol.16 No.1
Substituted 3-phenyl-1-silabutanes such as 3-phenyl-1-silabutane (1), 3-(2,5-dimethylphenyl)-1-silabutane (2), 3-(p-chlorotolyl)-1-silabutane (3), and 3-naphthyl-1-silabutane (4) were prepared in 62-96% yield by reduction of the corresponding substituted 3-phenyl-1,1-dichloro-1-silabutanes with LiAlH4. The dehydrogenative polymerization of the monomer silanes was carried out with Cp2MCl2/Red-Al (M=Ti, Hf) catalyst system. The molecular weight of the polymers produced ranged from 700 to 1300 (vs polystyrene) with degree of polymerization (DP) of 5 through 16 and with polydispersity index (PDI)=1.1-2.1. The dehydrogenative polymerization of the monomer silanes with Cp2TiCl2/Red-Al catalyst system occurred at a faster rate and produced somewhat higher molecular weights of polysilane than that with Cp2HfCl2/Red-Al catalyst system.
Photopolymerization of Methyl Methacrylate with 1,4-$C_6H_4(SiH_{3-x}Me_x)_2$
우희권,오은미,박종학,김보혜,김용남,윤찬호,함희숙,U, Hui Gwon,O, Eun Mi,Park, Jong Hak,Kim, Bo Hye,Kim, Yong Nam,Yun, Chan Ho,Ham, Hui Suk Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.3
The bulk photopolymerization of methyl methacrylate(MMA) with bis(silane)s such as 1,4-$C_6H_4(SiH_3)_2$ (1) and 1,4-$C_6H_4(SiH_2Me)_2$ (2) was performed to produce poly(MMA)s possessing the corresponding bis(silyl) moiety as an end group. For the bis(silane)s, while the polymerizaiton yields and the polymer molecular weights decreased, the TGA residue yields and the relative intensities of Si-H IR stretching bands increased as the relative bis(silane) concentration over MMA increased. The polymerizaion yield, polymer molecular weight, and TGA residue yield of MMA with 1 were found to be higher than those with 2. The bis(silane)s appears to influence significantly upon the photopolymerization of MMA as both chain initiation and chain transfer agents.
Photopolymerization of Methyl Methacrylate with Disilanes
우희권,홍란영,박진영,정영태,박형륜,함희석,U, Hui Gwon,Hong, Ran Yeong,Park, Jin Yeong,Jeong, Yeong Tae,Park, Hyeong Ryun,Ham, Hui Seok Korean Chemical Society 1996 Bulletin of the Korean Chemical Society Vol.17 No.1
The bulk photopolymerization of methyl methacrylate (MMA) with disilanes such as 1,2-diphenyldisilane and 2-phenyl-1,3-disilapropane was carried out to yield poly(MMA)s containing the corresponding disilyl moiety presumably as an end group. It was found that while the polymerization yields and the polymer molecular weights decreased as the relative disilane concentration increased, the TGA residue yields and the relative intensities of SiH IR stretching bands increased with increment of molar ratio of disilane over MMA. The photopolymerization of MMA with 2-phenyl-1,3-disilapropane produced higher-molecular-weight polymer with lower TGA residue yield when compared to the photopolymerization of MMA with 1,2-diphenyldisilane. The disilanes seemed to significantly influence on the photopolymerization as both chain initiation and chain transfer agents.