화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.12, No.3, 316-321, June, 2004
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Copolymerizations of Ethylene with 1-Hexene over ansa-Metallocene Diamide Complexes
Il Kim†, Chang Hun Kwak, Gi Wan Son, Jae Sung Kim, Sinoj Abraham, Bijal K. B, Chang-Sik Ha, Bu Ung Kim, Nam Ju Jo, Jang Woo Lee, and Jin Kook Lee
  • Division of Chemical Engineering, Pusan National University, 30 Jangjeon, Geumjeong, Busan 609-735, Korea
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We have performed copolymerizations of ethylene with 1-hexene using various ansa-metallocene compounds in the presence of the non-coordinative [CPh3][B(C6F5)4] ion pair as a cocatalyst. The metallocenes chosen for this study are isospecific metallocene diamide compounds, rac-(EBI)Zr(NMe2)2 [1, EBI = ethylene-1,2-bis(1-indenyl)], rac-(EBI)Hf(NMe2)2 (2), rac-(EBI)Zr(NC4H8)2 (3), and rac-(CH3)2Si(1-C5H2-2-CH3-4-tC4H9)2 Zr(NMe2)2 (4), and syndiospecific metallocene dimethyl compounds, ethylidene(cyclopentadienyl)(9-fluorenyl) ZrMe2 [5, Et(Flu)(Cp)ZrMe2] and isopropylidene(cyclopentadienyl)(9-fluorenyl)ZrMe2 [6, iPr(Flu)(Cp)ZrMe2]. The copolymerization rate decreased in the order 4 > 1 ~ 3 > 2 > 5 > 6. The reactivity of 1-hexene decreased in the order 2 > 6 > 1 ~ 3 ~ 5 > 4. We characterized the microstructure of the resulting poly(ethylene-co-1-hexene) by 13C NMR spectroscopy and investigated various other properties of the copolymers in detail.
Keywords:metallocene catalyst;copolymerization;ethylene;1-hexene;comonomer reactivity.
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