摘要
作者采用２ ，４ ，４三甲基２氯戊烷（ Ｔ Ｍ Ｐ Ｃｌ）／ Ｔｉ Ｃｌ４ 引发剂体系，在电子给体存在下，对异丁烯（ Ｉ Ｂ） 的活性阳离子聚合进行了研究．在 Ｔ Ｍ Ｐ Ｃｌ／ Ｔｉ Ｃｌ４／ Ｉ Ｂ 二氯甲烷／ 己烷（４０／６０ Ｖ／ Ｖ）／ － ８０ ℃聚合系统中，以 Ｎ， Ｎ二甲基苯胺、吡啶及三乙胺为电子给体，对聚合反应速率及产物分子量分布的影响进行了研究．发现当 Ｎ， Ｎ二甲基苯胺或三乙胺的浓度稍高于质子性杂质的浓度时，即能实现异丁烯的活性聚合，得到分子量分布较窄的聚合物．电子给体的主要作用是质子捕捉剂，抑制痕量水的引发。
The living carbocationic polymerization of isobutylene( I B) has been investigatedby the 2 chloro 2 ,4 ,4 trimethylpentane ( T M P Cl)/ Ti Cl4 initiating system in the presence of N, N dimethylaniline ( D M A B) and Et3 Nas electron pair donors ( E Ds) by use ofthe mixedsolvent dichloromethane hexane (40/60 V/ V)/ at - 80 ℃under conventional laboratoryconditions. It is demonstrated that living polymerization can be achieved when theconcentration of electron pair donors such as D M A Bor Et3 Nis higher than that of tracewater in the polymerization system ,and that polymers with narrow molecular weightdistribution can be obtained . The rate of polymerizationis also reduced because of adding E Dswhich indicates that stabler active centers areformed .
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1999年第5期596-599,共4页
Acta Polymerica Sinica
关键词
聚异丁烯
异丁烯
阳离子聚合
活性聚合
Isobutylene , Living polymerization , Cationic polymerization , Electron pair donors
