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Molecular Structure of 113C-C2H4/C3H6 Copolymers Prepared in the Presence of Half Sandwich Titanium Methyl – B(C6F5)3 Catalysts

✍ Scribed by Irene Sessa; Zsolt Csok; Adolfo Zambelli

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 167 KB
Volume: 206
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.200500342

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✦ Synopsis

Abstract

Summary: Copolymers of propylene with 1^13^C‐ethylene (99% isotopic purity) have been prepared in the presence of Cp*Ti(CH~3~)~3~ – B(C~6~F~5~)~3~ (I) or CpTi(CH~3~)~3~ – B(C~6~F~5~)~3~ (II) (Cp = cyclopentadienyl, Cp* = pentamethylcyclopentadienyl). ^13^C NMR analysis confirms previous findings that propylene polymerization in the presence of I is highly regioselective and somewhat isoselective, while catalyst II produces regioblock polypropylene. In the presence of II, polymerization is slightly syndioselective and the average size of the primary regioblocks seems larger than that of the secondary ones. Moreover, secondary insertion seems more syndioselective than the primary.

^13^C NMR spectra of samples I.2 and II.2.

magnified image^13^C NMR spectra of samples I.2 and II.2.

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