聚苯乙烯为规整侧链的支化SIS的设计及合成

Design and Synthesis of Graft SIS with Ordered Polystyrene Side Chains

摘要:

采用负离子聚合方法设计合成含苯乙烯基末端的聚苯乙烯大分子单体，并以正丁基锂为引发剂，四氢呋喃（THF）为调节剂，环己烷为溶剂进行异戊二烯与大单体的负离子共聚合，制备出侧链规整的支化结构SIS。通过核磁共振和凝胶渗透色谱等手段对聚苯乙烯大分子单体和支化SIS进行表征，利用旋转流变仪对支化SIS进行流变性能表征。结果表明，利用上述聚合方法成功合成了分子量3000～5000 的聚苯乙烯大单体；使用聚苯乙烯大单体制备的支化结构SIS分子量可控，分布窄，侧链分布均匀，并且其流体黏度明显低于相同分子量及结合苯乙烯含量线型结构的SIS。

Abstract:

A series of (p-vinylbenzyl)polystyrene macromonomers were synthesized by living anionic polymerization. The graft SIS with ordered polystyrene side chains was prepared by anionic copolymerization, using n-BuLi as initiator, THF as modifier, cyclohexane as solvent, polystyrene macromonomer and isoprene as monomers. The polystyrene macromonomers and graft SIS were characterized by proton nuclear magnetic resonance spectroscopy and gel permeation chromatography, and the rheological properties of graft SIS were characterized by rotational rheometer . The results showed that polystyrene macromonomers which molecular weight were between 3000～5000 could be synthesized by above method. The graft SIS synthesized by polystyrene macromonomers with characteristics of controlled, narrowed molecular weight distribution and ordered side chains. And the apparent viscosity of graft SIS synthesized by polystyrene macromonomers were low than that of linear SIS which has the similar molecular weight and the content of bounded styrene.