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2008•Journal of Hebei University of TechnologyRequires access

Copolymerization of Ethylene and α-Olefins with Bridged Metallocene/MAO

Binyuan Liu

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Abstract

Copolymerization of ethylene and α-olefins via novel cyclohexylidene-bridged metallocenes [CH25C] (t-BuCp)2ZrCl2(I),[CH25C](t-BuCp)2TiCl2 (Ⅱ) activated with MAO. There exhibit the relationship between structural characteristics and the catalytic properties with behavior of polymers. And both catalyst I and II presented a comonomer effect in copolymerization activity by increasing the initial concentration of α-olefin (1-hexene, 1-octene). The melting points of the copolymers decreased with the increasing of comonomer, and the enthalpies of fusion decrease greatly due to the lower crystallinity. The selectivity of metallocene Ⅱ was bigger than metallocene I due to the larger reaction space of the metal center in metallocene I.

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Copolymerization of ethylene and α-olefins via novel cyclohexylidene-bridged metallocenes [CH25C] (t-BuCp)2ZrCl2(I),[CH25C](t-BuCp)2TiCl2 (Ⅱ) activated with MAO. There exhibit the relationship between structural characteristics and the catalytic properties with behavior of polymers. And both catalyst I and II presented a comonomer effect in copolymerization activity by increasing the initial concentration of α-olefin (1-hexene, 1-octene). The melting points of the copolymers decreased with the increasing of comonomer, and the enthalpies of fusion decrease greatly due to the lower crystallinity. The selectivity of metallocene Ⅱ was bigger than metallocene I due to the larger reaction space of the metal center in metallocene I.

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Available abstract

Copolymerization of ethylene and α-olefins via novel cyclohexylidene-bridged metallocenes [CH25C] (t-BuCp)2ZrCl2(I),[CH25C](t-BuCp)2TiCl2 (Ⅱ) activated with MAO. There exhibit the relationship between structural characteristics and the catalytic properties with behavior of polymers. And both catalyst I and II presented a comonomer effect in copolymerization activity by increasing the initial concentration of α-olefin (1-hexene, 1-octene). The melting points of the copolymers decreased with the increasing of comonomer, and the enthalpies of fusion decrease greatly due to the lower crystallinity. The selectivity of metallocene Ⅱ was bigger than metallocene I due to the larger reaction space of the metal center in metallocene I.

Key concepts: Comonomer, Metallocene, Copolymer, Ethylene, Polymer chemistry, Post-metallocene catalyst, Olefin fiber, Materials science

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