双峰乙烯/1-辛烯共聚物的制备及其性能OA北大核心CSTPCD

Four kinds of metallocene catalysts with different structures were prepared.By combining two metallocene catalysts,the ethylene/1-octene copolymer with bimodal molecular weight distribution was prepared,and the effect of bimodal molecular weight distribution on the properties of copolymers was analyzed by GPC,DSC,13C NMR.Experimental results show that the ethylene/1-octene copolymer with bimodal molecular weight distribution can be successfully prepared by combining the metallocene catalyst M1 with M4 or M2 with M3.The prepared bimodal distribution copolymer has few 1-octene-enriched sequences,and the low melt flow rate results in good processing performance,which has density,crystalline state properties and amorphous state properties close to those by the catalyst with low copolymerization ability,and has high tensile strength,high elongation at break and good elastic recovery performance.