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A Study on the Coordination Polymerization Using C2-Symmetric Dichloro[rac-ethylenebisindenyl] zirconium(IV)/Methylaluminoxane System

C2-Symmetric Dichloro[rac-ethylenebisindenyl] zirconium(IV)/Methylaluminoxane 시스템을 이용한 배위 중합에 관한 연구

  • Received : 2012.11.26
  • Accepted : 2012.12.10
  • Published : 2013.03.31

Abstract

We synthesized polyethylene, poly(ethylene-co-1-decene), poly(ethylene-co-p-methylstyrene), and poly(ethylene-ter-1-decene-ter-p-methystyrene) using a rac-$Et(Ind)_2ZrCl_2$ metallocene catalyst and a methylaluminoxane cocatalyst system. The materials were characterized using nuclear magnetic spectroscopy and fourier transform infrared spectroscopy. To identify suitable reaction conditions for terpolymerization, we studied the effects of catalyst content, cocatalyst/catalyst molar ratio, polymerization time, and polymerization temperature. As the catalyst content increased, the catalytic activity and the molecular weight of the terpolymers increased. The catalytic activity sharply increased but little change was observed after a polymerization time of 30 min. The increase in the cocatalyst/catalyst molar ratio resulted in a decrease in the molecular weight of the terpolymers and an increase in the catalytic activity to some degree. The catalytic activity increased with increasing polymerization temperature, while the molecular weight of the terpolymers decreased.

Acknowledgement

Supported by : Ministry of Knowledge Economy

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