Vinyl-polymerization of norborene catalyzed by bis-[N-(substituted methyl)-salicylideneiminato]nickel/MAO system

摘要

The bis-[N-(substituted methyl)-salicylideneiminato]nickel/MAO systems were utilized to promote the vnylic homopolymerization of norbornene.The results displayed that steric hindrance has significant effects on their catalytic activities for polymerization of norbornene.The complex a,bis-[N-(substituted methyl)-salicylideneiminato]nickel,is systematically investigated with th catalytic activity up to 4.23X1-~8 g PNB/(mol N h) and the average moleculr weight up to 3.26X10~6 g/mol.All the polymer samples obtained here are soluble at room temperature in chlorobenzene.No indication of stereoregularity was observed;this was verified by the amorphous morphology of the products.The catalytic activities,yields,molecular weights and molecular weight distributions could be controlled over a wide range via variations of the reaction parameters.