Stereochemical Structure of Polypropylene Obtained in the Presence of Half‐Sandwich Titanium Complexes | Zendy

Csok Zsolt | Zendy; Liguori Dario | Zendy; Sessa Irene | Zendy; Zani Carla | Zendy; Zambelli Adolfo | Zendy

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Stereochemical Structure of Polypropylene Obtained in the Presence of Half‐Sandwich Titanium Complexes

Author(s) -

Csok Zsolt,

Liguori Dario,

Sessa Irene,

Zani Carla,

Zambelli Adolfo

Publication year - 2004

Publication title -

macromolecular chemistry and physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.57

H-Index - 112

eISSN - 1521-3935

pISSN - 1022-1352

DOI - 10.1002/macp.200400138

Subject(s) - tacticity , polypropylene , propene , polymerization , polymer chemistry , elastomer , nmr spectra database , titanium , materials science , chemistry , spectral line , polymer , organic chemistry , composite material , catalysis , astronomy , physics

Summary: The polymerization of propene in the presence of CpTi(CH 3 ) 3 /B(C 6 F 5 ) 3 , at low temperature, affords prevailingly syndiotactic elastomeric polypropylene. In the presence of methylalumoxane (MAO) and under the same polymerization conditions, both CpTi(CH 3 ) 3 and CpTiCl 3 afford elastomeric polypropylene with a stereochemical structure ranging from prevailingly syndiotactic to prevailingly isotactic, depending on the concentration of MAO. A tentative rationalization of these results is provided.The methyl regions of the 13 C NMR spectra of polypropylenes obtained for different amounts of MAO (0.001 mol: top and 0.09 mol: bottom).

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