Study on chain end structures of polypropylenes prepared with different symmetrical metallocene catalysts

Kawahara N; Kojoh S; Matsuo S; Kaneko H; Matsugi T; Toda Y; Mizuno A; Kashiwa N

Polymer, Vol.45, No.9, 2883-2888, 2004

DOI10.1016/j.polymer.2004.02.055 Export Citation

Study on chain end structures of polypropylenes prepared with different symmetrical metallocene catalysts

Kawahara N, Kojoh S, Matsuo S, Kaneko H, Matsugi T, Toda Y, Mizuno A, Kashiwa N

Propylene homopolymerizations were conducted by using three kinds of metallocenes: Cp2ZrCl2, En(Ind)(2)ZrCl2 and iPr(Cp)(Flu)ZrCl2, all of which were activated with methylaluminoxane. Detailed NMR analyses of the chain ends in the resulting polymers were carried out to discuss the chain end structures of the polypropylenes and the mechanism of polymerization. The characteristic of each metallocene for the mechanism of polymerization was also described. (C) 2004 Elsevier Ltd. All rights reserved.

Keywords:metallocene catalyst;polypropylene;analytical characterization