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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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正离子聚合制备具有双峰分布丁基橡胶及其结构性能研究
DOI: 10.11777/j.issn1000-3304.2015.15011, PP. 1028-1035
Keywords: 大分子单体,正离子聚合,丁基橡胶,支化聚合物,应力松弛
Abstract:
通过活性负离子聚合法制备了具有不同微观结构的聚(苯乙烯-b-异戊二烯-b-苯乙烯)三嵌段共聚物(SIpS),并将其作为正离子聚合的大分子单体.采用2-氯-2,4,4-三甲基戊烷(TMPCl)/2,6-二叔丁基吡啶(DtBP)/倍半乙基氯化铝(Al2Et3Cl3)的正离子聚合引发体系,引发异丁烯、异戊二烯以及SIpS结构中可反应的双键,合成了具有双峰分布的支化丁基橡胶.研究表明,SIpS中聚异戊二烯的3,4-结构有着更高的反应活性,更容易参与正离子聚合.随着SIpS中聚异戊二烯段含量的增加,支化丁基橡胶的产率增加,分子量也随之增加,聚合物溶液的特性黏数降低.通过体积排斥色谱(SEC)(多角激光光散射仪/示差监测器/在线黏度仪)及GPC-UV联用等仪器对支化丁基橡胶进行结构表征.证实了SIpS成功参与接枝反应,制备的丁基橡胶存在支化结构,而且产生的高分子区聚合物并不是由大分子单体物理混合所产生的.相较于线性丁基橡胶,支化丁基橡胶有着更快的应力松弛速率和更佳的物理机械性能.
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