Copolymerization of ethylene with linear 1-alkenes in the presence of different Ziegler-Natta catalysts

TiCl3-AlEt2Cl

VOCl3-Al2Et3Cl3and Ti(VMgCl2-AlR3

at 30℃ were investigated

and reactivity ratios for all pairs ethylene-1-alkene were determined . It was found that

for heterogeneous catalysts

the copolymerization reactivity of linear 1-alkenes was greatly improved when a small amount of propylene was present in the polymerization

while for homogeneous catalyst VOCl3

no change was observed. It seems that a synergistic effect exizted in the reactivities of propylene

linear l-alkene and active site in the polymerization with ethylene.