丙烯丁烯共聚物的组成和等规度分布

COMPOSITION AND TACTICITY DISTRIBUTION OF PROPYLENE BUTENE COPOLYMER

丙烯丁烯共聚物的组成和等规度分布徐君庭封麟先杨士林（浙江大学高分子科学与工程学系杭州３１００２７）关键词丙烯丁烯共聚物，ＺｉｅｇｌｅｒＮａｔａ催化剂，分级用负载型ＺｉｅｇｌｅｒＮａｔａ催化剂制备的聚丙烯其等规度往往分布较宽，具有一定的分散性...

Copolymer of propylene with a small amount of butene was prepared with supported Ziegler Natta catalyst MgCl 2/TiCl 4 AlEt 3/DPDMS and was fractionated with preparative temperature rising elution fractionation technique.The composition and tacticity distribution of copolymer were studied.It is found that the copolymer has a broad tacticity distribution and fractionation is mainly conducted according to tacticity.Compositional heterogeneity also exists to some extent.Isotacticity of fractions increases with elution temperature,but butene content shows a maximum in the fraction eluted at 70℃.With combination of previous work,this phenomenon is explained to be the result of the presence of electron donor in aspecific active site.