화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.18, No.5, 516-521, October, 2007
Export Citation
rac-Me2Si(2-p-tolylindenyl)2ZrCl2 촉매를 이용한 에틸렌/1-옥텐의 공중합 특성
Characteristics of Copolymerization of Ethylene/1-Octene with rac-Me2Si(2-p-tolylindenyl)2ZrCl2 Catalyst
안성현, 박융호†
  • 한양대학교 재료화학공학부
Sung-Hyun Ahn, and Yeung-Ho Park†
  • Division of Materials and Chemical Engineering, Hanyang University, Ansan 426-791, Korea
E-mail:
초록
새롭게 합성된 rac-Me2Si(2-p-tolylindenyl)2ZrCl2 촉매와 인디닐 리간드에 치환체가 붙어 있지 않는 상용촉매인 rac-Me2Si(Ind)2ZrCl2 촉매들을 조촉매인 methylaluminoxane (MMAO)를 사용하여 에틸렌/1-옥텐 공중합을 실시하였고, 반응물 내 1-옥텐의 농도를 변화시키며 얻어진 공중합체의 특성을 조사하였다. 촉매활성에 있어서 rac-Me2Si(2-p-tolylindenyl)2ZrCl2 촉매를 이용하여 공중합을 실시한 경우 다리구조를 가진 다른 촉매들과 달리 촉매활성이 감소하여 comonomer의 첨가에 따라 활성이 증가하는 comonomer effect는 발견되지 않았다. 13C NMR 분석에서 공중합체에 삽입된 1-옥텐의 양은 촉매 리간드에 붙은 치환체에 의존함을 보였으며, 2-p-tolyl 치환체가 붙은 촉매로 얻어진 공중합체에서 1-옥텐 삽입량이 더 높음을 보였다. DSC, GPC 분석에서 반응물 내 1-옥텐의 농도가 증가함에 따라 공중합체의 녹는점, 결정성, 분자량이 모두 감소하였으며 rac-Me2Si(Ind)2ZrCl2 촉매보다 rac-Me2Si(2-p-tolylindenyl)2ZrCl2 촉매의 경우 녹는점, 결정성 및 분자량의 감소폭이 더 크게 나타났다.
The copolymerization characteristics of a newly-synthesized catalyst, rac-Me2Si(2-p-tolylindenyl)2ZrCl2, and its analogue, rac-Me2Si(Ind)2ZrCl2, were examined in the ethylene/1-octene copolymerization while varying the concentration of 1-octene in the reaction mixture. The activity of rac-Me2Si(2-p-tolylindenyl)2ZrCl2 catalyst was decreased with increase of comonomer concentration, which is different from the usual comonomer effect of the metallocene catalysts with a bridge structure. The contents of 1-octene in the copolymer from the catalyst with 2-p-tolyl substituent were higher than those from the catalyst without that substituent. The melting point, crystallinity, and molecular weight decreased with comonomer content which was more apparent for rac-Me2Si(2-p-tolylindenyl)2ZrCl2 catalyst.
Keywords:rac-Me2Si(2-p-tolylindenyl)2ZrCl2 catalyst;metallocene catalyst;ethylene/1-octene copolymerization;comonomer effect;2-p-tolyl substituent
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