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Propylene polymerization in slurry catalyzed by titanium trichloride–diethyl aluminum chloride
Author(s) -
Kahraman R.,
Erdoğan M.,
Bilgiç T.,
Savaşçi Ö. T.
Publication year - 1994
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.1994.070530901
Subject(s) - polymerization , tacticity , arrhenius plot , catalysis , monomer , materials science , polymer , polymer chemistry , activation energy , yield (engineering) , coordination polymerization , titanium , solution polymerization , chemical engineering , chemistry , organic chemistry , composite material , metallurgy , engineering
Propylene is polymerized in a slurry over a TiCl 3 · ⅓AlCl 3 catalyst with a DEAC cocatalyst, approaching conditions of industrial relevance. The effects of various parameters such as temperature, pressure, cocatalyst‐to‐catalyst ratio, hydrogen concentration, and polymerization time are investigated with particular emphasis on the yield, tacticity, molecular weight, bulk density, and particle size of the resulting polymer. The highest yield and isotactic content are obtained at an Al/Ti ratio of 6, temperature of 70°C, and pressure of 9 kg/cm 2 g. The polymerization rate is found to be first order up to a monomer concentration of 2.5 mol/L. The overall activation energy of polymerization calculated from an Arrhenius plot is found to be 11.6 kcal/mol. A correlation between MFI and molecular weight is also presented. © 1994 John Wiley & Sons, Inc.