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ESR study on SiO 2 ‐supported half‐titanocene catalyst for syndiospecific polymerization of styrene
Author(s) -
Xu Junting,
Zhao Jian,
Fan Zhiqiang,
Feng Linxian
Publication year - 1997
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1997.030180916
Subject(s) - styrene , polymerization , polymer chemistry , catalysis , chemistry , copolymer , chemical engineering , materials science , organic chemistry , polymer , engineering
Monocyclopentadienyltitanium trichloride (CpTiCl 3 ) was directly immobilized on silica surface. The resulting CpTiCl 3 /SiO 2 ‐MAO was investigated in view of its suitability for syndiospecific polymerization of styrene using ESR spectroscopy. Polymerization results show that both the syndiotacticity and the activity decrease upon immobilization. A possible explanation is that the active sites may become aspecific after immobilization and part of the immobilized active sites can be leached into the solution in the presence of MAO.