【摘要】 以工业二乙烯基苯(DVB)作封端剂,用活性阴离子聚合方法首次成功地合成了乙烯基苯乙基聚苯乙烯大单体,讨论了封端时间、温度、活性种分子量、四氢呋喃及封端剂用量对合成效率的影响.结果表明:大单体的分子量与设计值很接近,分子量分布较窄,其数均官能度在0.9—1.1之间,偶联率小于10％.更多还原

【Abstract】 Polystyrene macromers containing vinylphenylethyl end group have been synthesized by using commercial divinylbenzene (a mixture of p-DVB, m-DVB, p-EVB and m-EVB) as capping reagent reacting with polystyryl lithium in the presence of polar additive THF. The influences of capping reaction time, temperature, MW of PSt , and the amount of capping reagent as well as THF used upon the efficiency of this synthesis were examined and discussed. The characterization of these macromers obtained showed that their MWs approximately equal to the values designed, MWDs were narrow enough, the percentage of dimerization of macromers were less than 10% and the average numbers of pendent double bonds per macromer molecule were between 0.9 and 1.1.更多还原