【摘要】 采用酸化的膨润土为催化剂,以α-甲基苯乙烯为原料合成了重均相对分子质量为3 891,相对分子质量分布（?）/（?）=2．42的聚α-甲基苯乙烯。考察了反应温度、反应时间、催化剂用量、原料纯度对产物分子量及分布的影响。当催化剂用量为原料质量的2．0%,反应温度为—3℃,反应时间为40 min时,原料转化率为60%,产物软化点为150℃。产物相对分子质量分布经GPC测定。¹H与¹³C NMR谱分析表明本品应是以烯封端的聚α-甲基苯乙烯。反应过程无废酸,利于环保。更多还原

【Abstract】 α-methylstyrene oligomer [P（α-MS）] with （?）=3891 and （?）/（?）=2.42 with the softening point of 150℃was prepared fromα-methylstyrene by the catalysis of acidified bentonite.The influ- ences of reaction temperature and time and the quantity of the catalyst on the molecular weight and its distribution in the product were investigated and the optimal conditions were found as follows:—3℃,catalyst 2% ofα-methylstyrene,reaction time 40 min.Under these conditions,the conversion ofα-methylstyrene was 60%.The molecular weight and distribution of P（α-MS） was determined based on GPC.Results of ¹H and ¹³C NMR confirmed that there is active—C=C—terminal unit in Pα- MS.This process produces no waste acid,and is environmentally friendly.更多还原