用负载型钛系催化剂进行丙烯-丁二烯共聚合的研究(Ⅰ)--共聚反应及共聚产物的表征

Studies on the Copolymerization of Propylene and Butadiene with Supported Titanium Catalysts(Ⅰ)--Copolymerization and Characterization of the Products

本文首次用负载型钛系催化剂TiCl_(4)/MgCl_(2)/AlEt_(3)和TiCl_(4)/MgCl_(2)/AlEt_(3)/苯甲酸乙酯(EB)进行了丙烯-丁二烯共聚合的研究,考察了不同单体比对共聚合的影响。结果表明,两种催化体系均能有效地进行丙烯-丁二烯的共聚合并各具特点。共聚产物经用溶剂萃取和IR、^(13)CNMR、X-光衍射、DTA等方法进行分析和表征,证明共聚物中存在有丙烯-丙烯和丁二烯-丁二烯长序列的结构。丁二烯链节的微观结构基本上是反式-1,4构型。

Propylene-butadiene copolymerizations with TiCl_(4)/MgCl_(2)/AlEt_(3) and TiCl_(4)/MgCl_(3)/AlEt_(3)/EB catalyst were studied respectively.It was found that copolymer obtained by the first catalyst give more butadiene content and lower reduced viscosity than that obtained by second one.The copolymerization products have been confirmed to be copolymer containing long propylene-propylene sequence and butadiene-butadiene sequence by solvent extraction,IR,^(13)CNMR,X-ray,and DTA.Butadiene unit in copolymers is exclusively in trans-1,4 structure.