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Propene polymerization with MgCl 2 ‐supported TiCl 4 /dioctylphthalate catalyst. I. Catalyst behavior
Author(s) -
Yang Chun B.,
Hsu Cheng C.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070580803
Subject(s) - catalysis , polymerization , propene , chemistry , polymer chemistry , base (topology) , chloride , silane , polymer , nuclear chemistry , organic chemistry , mathematical analysis , mathematics
Slurry polymerization of propene using MgCl 2 ‐supported TiCl 4 /dioctylphthalate catalysts were carried out in a semibatch reactor at a constant pressure to examine the effects of polymerization conditions on catalyst activity and polymer isotacticity. The catalysts were prepared at 80, 90, and 105°C, which gave different compositions of chemical complexes associated with the diester. Five alkyl aluminums (triethyl, triisobutyl, tri‐ n ‐hexyl, tri‐ n ‐octyl, and isoprenyl) were studied as cocatalysts. Among these, triethyl aluminum was found to be most effective for the catalysts prepared at 80 and 95°C, and tri‐ n ‐hexyl aluminum for the catalyst prepared at 105°C. Dimethoxydiphenyl silane and 2,2,6,6‐tetramethylpiperidine were employed to study their effects as an external Lewis base for the catalyst prepared at 105°C. In both cases, a small amount of either base resulted in significant increase in activity and isotacticity, which can be attributed to the high level of phthaloyl chloride complex in the catalyst. © 1995 John Wiley & Sons, Inc.