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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 28, 2007
Accepted October 5, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Embedded rac-Et[Ind]2ZrCl2 메탈로센 촉매를 이용한 Ethylene/α-olefin 공중합특성

Copolymerization of Ethylene and α-olefins with Embedded rac-Et[Ind]2ZrCl2 Catalyst

신동민 정진석^†

Dong Min Shin Jin Suk Chung^†

울산대학교 생명화학공학부, 680-749 울산시 남구 무거 2동 산29

School of Chemical Engineering and Bioengineering, University of Ulsan, San 29, Mugeo 2-dong, Nam-gu, Ulsan 680-749, Korea

jschung@mail.ulsan.ac.kr

Korean Chemical Engineering Research, February 2008, 46(1), 137-141(5), NONE Epub 28 February 2008

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Abstract

일반적인 균일계 촉매의 담지 방식 대신 스티렌을 이용하여 촉매를 embedding 시키는 간단한 방법으로 균일계 촉매를 불균일화하여 에틸렌과 알파올레핀의 공중합을 실험하였다. 미량의 스티렌을 rac-Et[Ind]2ZrCl2 촉매를 이용하여 중합시켜 embedded rac-Et[Ind]2ZrCl2 촉매(이하 embedded 촉매)를 제조하였으며 이를 이용하여 embedding 시키지 않은 homogeneous rac-Et[Ind]2ZrCl2 촉매(이하 homogeneous 촉매)를 사용하여 중합한 결과와 비교해 보았다. Embedded 촉매시스템을 사용하여 중합하는 경우, 공단량체의 종류에 상관없이 모든 공단량체 농도에서 촉매의 공중합 활성이 homogeneous 촉매보다 우수하였으며 embedding 과정이 균일계 메탈로센 촉매 활성점의 특성에 영향을 미치지 않았다. 또한 각 촉매시스템으로부터 생성된 고분자의 Tm과 NMR 분석 결과로 볼 때, embedded 촉매의 공단량체 삽입 능력은 homogeneous 촉매와 비슷하거나 조금 나은 수준의 결과를 보였으며, embedded 촉매로 중합한 공중합체는 겉보기밀도와 morphology가 우수하여, 스티렌을 이용한 촉매 embedding 방법이 담지 촉매를 이용하여 중합하는 효과를 보일 수 있음을 관찰할 수 있었다.

Copolymerization of ethylene and α-olefin using rac-Et[Ind]2ZrCl2/MAO catalyst embedded onto polystyrene was examined. The embedded catalyst was prepared by polymerizing a small amount of styrene with rac-Et[Ind]2ZrCl2. The catalytic activities of the embedded catalyst were higher than those of the homogeneous catalyst regardless of comonomer type and the characteristic of the active sites of the embedded catalyst was not affected during the embedding process. Based on the DSC and NMR analyses of the produced copolymers, it was thought that the embedded catalyst had similar or slightly better comonomer incorporation ability. Furthermore, the copolymers produced by the embedded catalyst had higher bulk densities and better particle morphology than those by the homogeneous catalyst.

Keywords

Copolymerization α-olefin Embedded Catalyst Styrene Particle Morphology

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