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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   JULY 2006 , Volume 15 , Number 7 (73); Page(s) 569 To 575.
 
Paper: 

GAS PHASE COPOLYMERIZATION OF ETHYLENE AND 1-BUTENE WITH PREPOLYMERIZED MGCL2 SUPPORTED ZIEGLER-NATTA CATALYST: EFFECT OF AL/TI RATIO

 
 
Author(s):  SALEHI MOBARAKEH H.*, FIROUZI MONFARED M., VAKILI MOHAMMAD
 
* Department of Polymer Science, Faculty of Science, Iran Polymer and Petrochemical Institute, Tehran, Iran
 
Abstract: 

Gas phase copolymerization of ethylene/1-butene was performed in a semibatch reactor using MgCl2 supported Ziegler-Natta catalyst. Prepolymerized catalysts with different Al/Ti ratios were prepared by slurry polymerization of ethylene and the resulting polymers were dried in-situ. DSC and FTIR were used to identify 1-butene incorporation in the copolymerization. DSC Measurements showed that by copolymerization of ethylene with 1-butene, Tm and the crystallinity decrease. This decrease is more pronounced in lower Al/Ti ratios. By increasing Al/Ti ratio, the crystallinity of copolymers increases. FTIR showed that with introducing 1-butene in the polymerization and formation of ethylene/1-butene copolymer, the A1378/A1368 ratio increases considerably. Polymerization rates were affected by Al/Ti ratio showing two regions of different slopes. The slopes in the first region in the polymerization rate curves are similar while the slopes in the second region vary depending on the Al/Ti ratio. The decay constant (kd) of catalyst deactivation was calculated and it was concluded that Al/Ti with value of 8 has a lower kd indicating lesser temperature variation during polymerization which is probably preferred in industrial production of ethylene- 1-butene copolymers.

 
Keyword(s): GAS PHASE, COPOLYMERIZATION, ETHYLENE, 1-BUTENE, ZIEGLER-NATTA CATALYST
 
References: 
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