摘要：

    Polyisobutylenes (PIBs) have excellent properties in chemical stability, thermal stability and resistance to oxidation, ozone and UV. The controlled/living cationic polymerizations of isobutylene (IB) near 100% of initiation efficiency have been achieved. PIBs or living PIB chains with designed number-average molecular weights (Mn) and narrow molecular weight distributions could be obtained. Livingness of cationic polymerization of IB was further confirmed by all monomer in (AMI) technique and incremental monomer addition (IMA) technique.
Stereoregularity is one of the most important factors to affect seriously the crystallinity and physical properties of polymers. It is really rather difficult to achieve high stereoregulation in cationic polymerization for the lack of controlling the stereochemistry and only few stereoregular polymers could be prepared. The stereospecific cationic polymerization of methylstyrene could be achieved in the presence of bulky triphenylamine and the polymers with several isotactic and atactic segments along macromolecular chains could be obtained. The crystallizable polymethylstyrene with high average-number molecular weights and high meso dyad (m) content of 81% could be prepared. The polymethylstyrene samples with predominant isotacticity could form crystal morphology with 10 ~ 20 μm in size by flow-induced crystallization under pressure at 180 ℃.
The triblock copolymers of PS-b-PIB-b-PS and PMS-b-PIB-b-PMS with totally saturated soft segments and crystallizable hard segments could be successfully synthesized via the combination of living cationic polymerization with stereospecific cationic polymerization by sequential monomer addition. The mechanical property and thermal property of these triblock copolymers have been improved. The self-assembly behavior and micromorphology of these polyisobutylene-based copolymers have been also investigated.
关键词：Polyisobutylene；Thermoplastic Elastomer; stereoregulation

 

 

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 个人简介：

　吴一弦，女，1967年生，教授，博导，教育部“长江学者”特聘教授，《科学通报》编委。现兼北京化工大学材料科学与工程学院大分子工程系主任及中国合成橡胶工业协会理事。吴一弦教授长期主要从事可控/活性聚合及合成橡胶的应用基础研究与技术开发，从实验室研究到工业化应用，多项技术已应用于万吨级合成橡胶的工业生产装置。承担或完成了包括国家973课题、国家863项目、国家自然科学基金项目、国防军品配套项目、中国石化股份公司项目等40余项。获国家技术发明二等奖1项及省部级科技奖励5项。发表学术论文90余篇，发明专利90余项（其中国际发明专利25项），著书《控制阳离子聚合及其应用》1部，参编著作3部。入选教育部优秀青年教师资助计划和新世纪优秀人才支持计划，获“新世纪巾帼发明家新秀奖”、中国青年科技奖、中国青年女科学家奖，入选“国家百千万人才工程”。