End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction
碩士 === 國立中正大學 === 化學工程所 === 97 === Syndiotactic polystyrene (sPS) possesses many good properties, including a high melting temperature, a high glass transition temperature, high crystallinity, good hardness and a fast crystallization rate, to be used as a high performance engineering plastic. Howeve...
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ndltd-TW-097CCU050630152016-05-04T04:26:06Z http://ndltd.ncl.edu.tw/handle/43793821960946194780 End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction 乙烯基矽烷化物誘導之選擇性鏈轉移反應:合成含對位聚苯乙烯之雙嵌段共聚物之新合成方法 Hao-jen Hsiao 蕭浩然 碩士 國立中正大學 化學工程所 97 Syndiotactic polystyrene (sPS) possesses many good properties, including a high melting temperature, a high glass transition temperature, high crystallinity, good hardness and a fast crystallization rate, to be used as a high performance engineering plastic. However, the high crystallinity of sPS also results in brittleness and low impact strength which may substantially limit the commercial applications of sPS. As the impact strength of sPS has been demonstrated to improve by linking or grafting with other polymer block, this research is aiming for the development of new methods that can lead to the successfully preparation of sPS-based diblock copolymers. By conducting the syndiospecific 4-chlorostyrene and 4-fluorostyrene polymerization using dimethylphenylvinylsilane (DMPhVS) as the chain transfer agent, vinylsilane end-capped syndiotactic poly-4-chlorostyrene (sP4CS) and vinylsilane end-capped syndiotactic poly-4-fluorostyrene (sP4FS) can be selectively produced by using Cp*Ti(OMe)3/MAO as the catalyst. The resulting end-capped polymers contain the uniform vinylsilane end group; thus, can be used as the end-functionalized stereoregular prepolymer for conducting subsequent postpolymerization for the preparation of sP4CS- and sP4FS-based stereoregular diblock copolymers. . Accordingly, we have successfully prepared the sP4CS-b-PLLA by conducting ring opening polymerization (ROP) of DL-lactide using the hydroxy-capped sP4CS as the macroinitiator. The sP4FS-b-aPS, on the other hand, can be selectively produced by conducting living radical (ATRP) polymerization of styrene using α-bromoisobutyl end-capped sP4FS as the macroinitiator. The diblock copolymers prepared by these new synthetic methods have been found to possess well-defined chemical structures (uniform block lengths and narrow ranges of molecular weight distribution) to be used in the self-assembly studies for displaying consistent nanomorphologies as revealed by TEM analyses Jing-Cherng Tsai 蔡敬誠 2009 學位論文 ; thesis 156 zh-TW |
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碩士 === 國立中正大學 === 化學工程所 === 97 === Syndiotactic polystyrene (sPS) possesses many good properties, including a high melting temperature, a high glass transition temperature, high crystallinity, good hardness and a fast crystallization rate, to be used as a high performance engineering plastic. However, the high crystallinity of sPS also results in brittleness and low impact strength which may substantially limit the commercial applications of sPS. As the impact strength of sPS has been demonstrated to improve by linking or grafting with other polymer block, this research is aiming for the development of new methods that can lead to the successfully preparation of sPS-based diblock copolymers.
By conducting the syndiospecific 4-chlorostyrene and 4-fluorostyrene polymerization using dimethylphenylvinylsilane (DMPhVS) as the chain transfer agent, vinylsilane end-capped syndiotactic poly-4-chlorostyrene (sP4CS) and vinylsilane end-capped syndiotactic poly-4-fluorostyrene (sP4FS) can be selectively produced by using Cp*Ti(OMe)3/MAO as the catalyst. The resulting end-capped polymers contain the uniform vinylsilane end group; thus, can be used as the end-functionalized stereoregular prepolymer for conducting subsequent postpolymerization for the preparation of sP4CS- and sP4FS-based stereoregular diblock copolymers. .
Accordingly, we have successfully prepared the sP4CS-b-PLLA by conducting ring opening polymerization (ROP) of DL-lactide using the hydroxy-capped sP4CS as the macroinitiator. The sP4FS-b-aPS, on the other hand, can be selectively produced by conducting living radical (ATRP) polymerization of styrene using α-bromoisobutyl end-capped sP4FS as the macroinitiator. The diblock copolymers prepared by these new synthetic methods have been found to possess well-defined chemical structures (uniform block lengths and narrow ranges of molecular weight distribution) to be used in the self-assembly studies for displaying consistent nanomorphologies as revealed by TEM analyses
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author2 |
Jing-Cherng Tsai |
author_facet |
Jing-Cherng Tsai Hao-jen Hsiao 蕭浩然 |
author |
Hao-jen Hsiao 蕭浩然 |
spellingShingle |
Hao-jen Hsiao 蕭浩然 End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction |
author_sort |
Hao-jen Hsiao |
title |
End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction |
title_short |
End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction |
title_full |
End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction |
title_fullStr |
End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction |
title_full_unstemmed |
End-Functionalization of Syndiotactic Polystyrene and Preparations of Syndiotactic Polystyrene Based Stereoregular Diblock Copolymers via the Vinylsilane-Induced Selective Chain Transfer Reaction |
title_sort |
end-functionalization of syndiotactic polystyrene and preparations of syndiotactic polystyrene based stereoregular diblock copolymers via the vinylsilane-induced selective chain transfer reaction |
publishDate |
2009 |
url |
http://ndltd.ncl.edu.tw/handle/43793821960946194780 |
work_keys_str_mv |
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