Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   JANUARI 2005 , Volume 14 , Number 1 (55); Page(s) 15 To 21.
 
Paper: 

ETHYLENE/PROPYLENE COPOLYMERIZATION USING CP2ZRCL2/MAO CATALYST: EFFECTS OF COPOLYMERIZATION CONDITIONS ON VISCOSITY AVERAGE MOLECULAR WEIGHT

 
 
Author(s):  SOBHAN MANESH K.*, HAJIZADEH AHMAD
 
* Chemistry Department, University of Birjand, Birjand, I.R. Iran
 
Abstract: 
Copolymerization of ethylene with propylene is carried out semi-continuously in toluene at atmospheric pressure and with various propylene/ethylene molar ratios. The polymerization temperature and cocatalyst/catalyst molar ratio were also varied in a wide range. Cp2ZrCl2/MAO System was used as catalyst. The viscosity average molecular weights of copolymers obtained were determined by measuring the intrinsic viscosity [ h]‌‌‌ and application of the Mark-Houwink equation. The values of molecular weights were found to be dependent on operating conditions except on polymerization time in the range 5-30 min. increasing the polymerization temperature, propylene/ethylene and cocatalyst/catalyst molar ratios caused a continuous decrease in molecular weight. An important reason for this effect was shown to be accelerated chain transfer reactions.
 
Keyword(s): EP COPOLYMERIZATION, SEMI-CONTINUOUS REACTOR, BIS-(CYCLOPENTADIENYL) ZIRCONIUM DICHLORIDE, METHYLALUMINOXANE, VISCOSITY AVERAGE MOLECULAR WEIGHT, CHAIN TRANSFER REACTION
 
References: 
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