摘要
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,ZieglerNata催化剂,分级用负载型ZieglerNata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.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1997年第4期508-512,共5页
Acta Polymerica Sinica
基金
国家自然科学基金