화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea Polymer Journal, Vol.7, No.3, 162-171, June, 1999
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Copolymerization of Ethylene and 1-Octene by syndiospecific Metallocenes: Comparison of Me2C(Cp)(Flu)ZrMe2 with Et(Cp)(Flu)ZrMe2
Il Kim†, Sun Young Kim, Chang-Soo Chli, Min Hyung Lee1, and Youngkyu Do1
  • Department of Chemical Engineering, University of ulsan, P.O.Box 18, Ulsan 680-749, Korea
  • 1Department of Chemistry & Center of Molecular Science, KAIST, Tajon 305-701, Korea
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Copolymerization of ethylene with 1-octene have been carried out by using two kinds of metallocene: highly syndiospecific isopropylidene(1-η5-cyclopentadienyl)(1-η5-fluorenyl)dimethylzirconium(Me2C(Flu)(Cp)ZrMe2, 1) and less syndiospecific (1-fluorenyl-2-cyclopentadienylethane)dimethylzirconium (Et(Flu)(Cp)ZrMe2, 2), in the presence of [Ph3C][B(C6F5)4]as a cocatalyst. The ethano bridged 2 compound of smaller dihedral angle showed much higher activity than the isopropyl bridged 1 compound in the ethylene homo- and co-polymerizations. The catalytic activities of the two catalysts were enhanced about twice in the presence of a suitable amount of 1-octene in the feed. The two catalysts showed a noticeable difference in the comonomer reactivity. The compound 1 is characterized by lower γE, taken as an index of ethylene reactivity, and higher reactivity of 1-octene than the compound 2.
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