乙烯-丁烯共聚物在透明抗冲聚丙烯中的作用

摘要

采用常压溶液法合成了乙烯-丁烯共聚物,利用GC,13C NMR等方法研究了乙烯-丁烯共聚的反应过程和共聚物的组成.通过对连续相聚丙烯与橡胶相乙烯-丁烯共聚物折光指数的测定,探讨了连续相与橡胶相折光指数的匹配规律.实验结果表明,乙烯-丁烯共聚物中含己烷可溶物和不溶物两部分,随原料气中1-丁烯含量的增加,可溶物含量增加,聚合活性则先增大后减小.不溶物基本为聚乙烯,而可溶物是乙烯含量较低的橡胶态乙烯-丁烯共聚物.原料气中乙烯含量的最佳范围是10％ ～ 40％(x),在此范围内得到的产物以可溶物为主,且可溶物和不溶物的折光指数均能与聚丙烯连续相的折光指数匹配.%Ethylene-butylene copolymers were synthesized under normal pressure,and the polymerization process and properties of the ethylene-butylene copolymers were researched by means of GC and 13C NMR.With polypropylene as the continuous phase and the ethylene-butylene copolymer as the rubber phase,the refractive index matching law of the continuous phase and rubber phase was studied.The results indicated that,the ethylene-butylene copolymer consisted of hexane soluble fraction and unsoluble fraction.With the 1-butylene content in feed gas,the soluble fraction increased,and the polymerization activity firstly increased and then decreased.The soluble fractions in the products were the ethylene-butylene copolymers with low ethylene content and the unsoluble fractions were mostly polyethylene with low butylene content.The optimal ethylene content in the feed gas is in the range of 10％-40％(x),and the products are mostly soluble,in which the refractive indexes of the soluble fraction and unsoluble fraction can match the refractive index of the continuous phase.