聚對位對甲基苯乙烯與聚環氧乙烷之立體規則性雙嵌段共聚物之合成與奈米結構自我組裝

Stereoregular Diblock Copolymer Of Syndiotactic Poly(4-methylstyrene) And Polyethylene oxide：Syntheses And Self-assembly Studies

李怡瑾(Yi-Jin Li)

指導教授 ： 蔡敬誠

國立中正大學/工學院/化學工程學系/碩士(2012年)

摘要

本實驗研究中使用金屬茂觸媒系統(Metallocene system)來進行反應，其所用的觸媒為：Cp*Ti(OMe)3，助觸媒為：MAO進行對位性聚4-甲基苯乙烯(syndiotatic poly-4-methylstyrene，sPMS)的合成，並藉由導入DMPVS作為鏈轉移劑，使得金屬茂觸媒系統的鏈轉移反應(chain transfer reaction)趨向專一，再經由雙氧水的氧化、水解反應可有效得到末端具有氫氧基的對位性聚4-甲基苯乙烯(hydroxyl-capped sPMS，sPMS-OH)，並改變其鏈轉移劑用量及反應溫度，以控制其分子量變化。
之後再以開環聚合方式，利用鉀金屬(K)作為co-initiator將其前驅物sPMS-OH轉換成sPMS-O-K+之macroinitiator，與環氧乙烷(EO)單體進行第二段嵌段高分子的鏈成長反應以合成出sPMS-b-PEO之雙嵌段共聚高分子。
本實驗可有效地控制雙嵌段共聚物之分子量與分子量分佈，另外藉由GPC、DSC、NMR、小角X光繞射分析之實驗結果確認本實驗可以成功合成出能進行奈米自我組裝之sPMS-block-PEO雙嵌段共聚物。

關鍵字

雙嵌段共聚高分子 ； 金屬茂觸媒系統 ； 開環聚合

並列摘要

In this research, stereoregular diblock copolymer of syndiotactic poly-4-methylstyrene block poly-ethylene oxide (sPMS-block-PEO) were prepared in two steps. First, dimethylphenylvinylsilane end-capped sPMS (DMPVS-capped sPMS) was prepared by syndiospecific polymerization of 4-methylstyrene conducted in the presence of dimethylphenylvinylsilane (DMPVS, chain transfer agent) using (Cp*Ti(OMe)3)/MAO as the syndiospecific catalyst. Subsequently, the resulting DMPVS-capped sPMS was allowed to undergo functional group transformation reaction to provide the OH-capped sPMS. The resulting hydroxyl end-group of the sPMS-OH can be used to undergo living ring opening polymerization of ethylene oxide for providing the sPMS-block-PEO as the structurally well-define stereoregular diblock copolymer for use in the self-assembly studies.

並列關鍵字

stereoregular diblock copolymer ； living ring opening polymerization ； chain transfer agent

參考文獻

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