Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 47, Issue 3, Pages 845-865Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/pola.23200
Keywords
chromium; Cr/silica catalyst; elasticity; ethylene polymerization; long chain branching; Phillips catalyst; polyethylene; polymerization catalyst; porosity
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The Phillips Cr/silica catalyst produces low levels of long chain branching (LCB) in polyethylene, which have a powerful influence on industrial molding behavior. Although many catalyst and reactor variables determine the degree of LCB, perhaps the most significant of these is the morphology of the silica support. In this study many different types of silicas were converted into Cr/silica catalysts, which were tested in ethylene polymerization, and the resultant polymer elasticity was then determined. In some experiments, the surface area of the catalyst seemed to correlate quite well with polymer elasticity. In other tests, however, no connection with surface area was evident but the pore volume was quite influential. Together, all these studies suggest that it is the degree of structural reinforcement of the silica matrix, rather than any one physical measurement of porosity, that influences elasticity. (C) 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47:845-865,2009
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