以丙烯为主体的二元及三元共聚研究──丙烯与乙烯和丁烯－1的共聚合

研究了ＭｇＣｌ２载体高效催化剂用于丙烯为主体的与乙烯和丁烯－１的二元及三元共聚合反应：选择了最佳的共聚合条件；实验测定了共聚单体配比对共聚合活性、共聚物分子量和物理性能的影响；并用１３Ｃ—ＮＭＲ分析了共聚物组成、序列分布和支链结构等微观结构信息．

INVESTIGATION OF CO-AND TERPOLYMERIZATION OF PROPYLENE AS A MAIN MONOMER──CO-AND TERPOLYMERIZATION OF PROPYLENE WITH ETHYLENE AND BUTENE-1

o-and terpolymerization of propylene ethylene and butene-1 with highly efficient supported Ziegler -Natta catalysts were investigated.The polymerization activities depended not only on the reaction temperatured,catalyst concentration and the molar ratio of Al/Ti,DDS]/TEA] but also on the monomer's composition It was found that the optimum conditions for the polymerization activities were T=50℃,Ti]=0.1 mM,Al/Ti= 100,DDS]/TEA]=0.1; the activities of propylene with ethylene and butene-1(P-E-B)terpolymerization were higher than those of propylene-ethylene(P-E)or propylene-butene-1(P-B) copolymerization nder the same conditions.Effects of the monomer composition on the physical properties of co-and terpolymers were also described.With increasing the concentration of the comonomers the contents of both ethylene and butene-1 in P-E-B terpolymers as P-E,P-B copolymers increased;but the intrinsic viscosity(nin),density,melting point and crystalinity of the products decreased.Finally,the microstructures of co-and terpolymers were examined by 13C-NMR spectra which indicated the existence of long propylene chain sequence in the co-and terpolymers.