The copolymerization of ethylene and vinylcyclohexane has been investigated using soluble catalytic systems Cp2ZrC12/MAO (Cp=r/s cyclopentadienyl; MAO=methylaluminoxane) and Cp2ZrMe2/MAO at 70°C and room temperature. Under the reaction conditions employed, up to 1.7 mol% of vinylcyclohexane could be introduced into the polyethylene chains. The molecular structure and comonomer content of the copolymers were determined by 13 C nuclear magnetic resonance. The com onomer content of the polymers was found to increase with the comonomer concentration in the feed. The comonomer was found to be mainly statistically distributed. With samples containing higher comonomer content, however, the formation of a relatively very small amount of short blocks was noted. The average molecular weights of the copolymers were lower than those of pure polyethylene prepared under identical conditions. As expected, the vinylcyclohexane decreased the melting point and crystallinity of the polymers
Посилання на статтю:
Copolymerization of ethylene and vinylcyclohexane using soluble Ziegler-Natta catalysts / R. Mani and Charles M. Burns* // Polymer. – 1993. – Vol 34. – P. 1941-1945.