用钛／锂催化剂合成乙烯、丙烯的嵌段共聚物

Synthesis of a block copolymer from ethylene and propylene by Ti/Li catalyst

本文研究了用ＴｉＣｌ４－ｎ－Ｂｕｌｉ催化剂、顺序加料方法合成含聚乙烯－乙两共聚物的嵌段共聚物，考察了聚合活性链的寿命及各种聚合条件对嵌段物收率及产物组成、结构的影响．用溶剂萃取法对所得产物进行了充分分离，并用多种方法证明所得产物为聚乙烯－己丙共聚物二嵌段共聚物与聚乙烯、乙丙共聚物的混合物，其中嵌段物的含量为７％～３０％．对嵌段物的结构、性能用ＤＳＣ、Ｘ－射线衍射等方法作了初步研究．

An A -B type block copolymer with polyethylene block and ethylene-propylenecopolymer block was synthesized by a TiCl_4/n-BuLl catalyst through monomer switching.The life time of propagation chains and the effects of polymerization conditions on the yieldand atructure of block copolymer were studied.The polymerization product is composed of7% ～30% of block copolymer.as well as ethylene-propylene random copolymer andpolyethylene, a. proved by solvent extraction. The atructure and properties of the blockcopolymer were investigated by DSC, X-ray diffraction and other methods.,