一氯二乙基铝/氯苄/吡啶引发体系引发的异丁烯阳离子聚合

Carbocationic Polymerization of Isobutylene by the Initiator System of Diethyl Aluminium Chloride/Benzyl Chloride/Pyridine

活性聚合是控制聚合物的分子量、分子量分布、结构和端基的最有效和简单的方法之一。就异丁烯单体(IB)而言,自Kennedy首次报道其活性阳离子聚合以来,陆续报道了一些新的活性引发聚合体系,这些体系主要有两类:一类是叔丁基的酯、醚、醇与路易斯酸构成的引发体系;另一类是特丁基氯与路易斯酸加电子给予体(如DMSO、DMA等)。

Carbocationic polymerization of isobutylene was initiated by the system of diethyl aluminium chloride/benzyl chloride/pyridine. It was found that in the presence of electron donor (pyridine), the initiator efficiency increased and the molecular wieght distribution of the polymers narrowed. The linear relationship between the molecular weight and amount of poly-isobutylene which was prepared by the increment monomer addition experiment, and its amount showed that the polymerization got some living features.