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Ethylene/styrene copolymerization in the presence of cyclopentadienyltitanium tribenzyl oxide and various methylaluminoxanes
Author(s) -
Wu Qing,
Ye Zhong,
Gao Qinghai,
Lin Shangan
Publication year - 1998
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/(sici)1521-3935(19980801)199:8<1715::aid-macp1715>3.0.co;2-k
Subject(s) - copolymer , styrene , ethylene oxide , polymer chemistry , oxide , ethylene , styrene oxide , chemistry , organic chemistry , catalysis , polymer
Copolymerizations of ethylene and styrene in the presence of CpTi(OBz) 3 and various MAOs have been investigated. It was found that the composition and structure of the copolymerization products are strongly dependent on the amount of free alkylaluminium, involving the residual trimethylaluminium (TMA) in MAO and external alkylaluminium (TIBA), in the systems. The catalyst system containing less free alkylaluminium affords an ethylene/styrene copolymer, while that containing plenty of free alkylaluminium affords a mixture of the corresponding homopolymers. This seems to be due to the existence of different Ti species caused by the free alkylaluminium content in the systems.