Synthesis of polystyrene with high melting temperature through BDE/CuCl catalyzed polymerization
No matter what the polymerization manner was, polystyrene withunique high Tm (Tm = 170-285℃) was obtained through polymerization of styrene if the amount of BDE/CuCl catalyst was highly increased (mol ratio: St:CuCl = 25:1-2.5:1). Partial crystallinity of the PSt was observed by characterizations of X-ray diffraction and DSC. Spectra of 1H-NMR and 13C-NMR showed that syndiotactic structure contained in the obtained PSt was 5% more than that in aPSt (atactic polystyrene). According to the proposed "coordinated radical cage" mechanism, the coordinated state between radical and catalyst center metal Cu should be more closely packed with increasing the BDE/CuCl catalyst amount, which was induced to partial stereospecific polymerization in the coordinated radical polymerization of St.
作 者： Wan Xiaolong NI Baibing Liu Yanfei YING Shengkang 作者单位： Lab of Living Polymerization, East China University of Science and Technology, Shanghai 200237, China 刊 名： 中国科学B辑(英文版) EI SCI 英文刊名： SCIENCE IN CHINA(SCIENTIA SINICA) 年，卷(期)： 2001 44(1) 分类号： O6 关键词： polystyrene "living"/controlled polymerization synthesis bis(dimethylaminoethyl) ether