Microstructure of Polypropylene Prepared with Kaminsky Catalyst System

Kaminsky 촉매계로 제조한 폴리프로필렌의 미세구조

  • Lee, Cheal-Gyu (Department of Environmental Engineering, Chongju University)
  • 이철규 (청주대학교 이공대학 환경공학과)
  • Received : 1996.02.14
  • Published : 1996.06.25

Abstract

Kaminsky catalyst system($Et(Ind)_2ZrCl_2$ and MAO(methylaluminoxane)) was prepared. Propylene was polymerized at $60^{\circ}C$ in this system. The microstructure was studied by using the $^{13}C$ NMR spectrometer. From the $^{13}C$ NMR data, the 2, 1-insertion of propylene was controlled stereospecific by Kaminsky catalyst due to the structures of meso and racemo I. After the 2, 1-insertion of propylene, 1, 2-insertion of the chain end was less stereospecifically controlled by the catalyst.

본 논문에서는 Kaminsky 촉매계 ($Et(Ind)_2ZrCl_2$와 MAO(methylaluminoxane))를 합성하여 $60^{\circ}C$에서 폴리프로필렌을 중합하였다. 본 연구에서는 중합한 폴리프로필렌의 미세구조를 $^{13}C$ NMR 분석 결과로부터 meso와 racemo I 구조가 나타난 것으로 보아 프로필렌의 2, 1-삽입은 Kaminsky 촉매에 의해 입체 특이적으로 조절됨을 알 수 있다. 그리고 2, 1-삽입후에 체인 말단에 1, 2-삽입되는 프로필렌은 입체 특이적인 조절이 덜 됨을 알수 있다.

Keywords

Acknowledgement

Supported by : 청주대학교