给电子体对VOCl_3/Al_2Et_3Cl_3催化的乙丙橡胶结构和性能的影响

Effect of electron donor on structure and properties of ethylene-propylene rubber catalyzed with VOCl_3/Al_2Et_3Cl_3

采用VOCl_3/Al_2Et_3Cl_3体系催化乙烯-丙烯共聚合合成乙丙橡胶(EPR),考察了给电子体苯甲酸乙酯和邻苯二甲酸二异丁酯对EPR结构和性能的影响。结果表明,少量给电子体的加入可以明显提高VOCl_3/Al_2Et_3Cl_3催化乙烯-丙烯共聚合的催化活性,随着给电子体加入量的增大,催化活性反而下降;给电子体的加入并未引入结晶的长序列乙烯嵌段,仅提高了产物的相对分子质量;给电子体的加入提高了丙烯单体的共聚能力,使EPR的丙烯结合量增加。

The ethylene-propylene rubber（ EPR）was synthesized by ethylene-propylene copolymerization,which catalyzed with VOCl_3/Al_2Et_3Cl_3 system,and the effect of electron donor ethyl benzoate,diisobutyl phthalate on structure and properties of EPR was studied. The results showed that the catalyst activity could be improved by adding small amount of electron donor to the polymerization system,but the catalyst activity decreased with further increase the amount of electron donor. The copolymers were amorphous,without long ethylene block segment,with higher relative molecular mass than the copolymer prepared by electron donor free catalyst system.Moreover,the addition of electron donor to VOCl_3/Al_2Et_3Cl_3 system, the copolymerization ability of propylene monomer improved,and the bound of propylene of EPR increased.