Preparation of Bi-supported Ziegler-Natta catalysts of MgCl2/SiO2 for Ethylene polymerization
محل انتشار: ششمین کنگره بین المللی مهندسی شیمی
سال انتشار: 1388
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,702
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شناسه ملی سند علمی:
ICHEC06_313
تاریخ نمایه سازی: 1 مهر 1388
چکیده مقاله:
A novel MgCl2/SiO2-supported Ziegler-Natta catalyst was synthesized. Slurry polymerization of ethylene was carried out using the catalyst in dry hexane, while; TEA was used as cocatalyst. The cocatalysts effects, such as cocatalyst/catalyst molar ratio, H2 concentration, polymerization temperature and monomer pressure on activity of the catalyst were investigated. Ti concentration in solid catalyst was 0.86% wt. Structural study was carried out using FTIR, SEM, XRF,GPC and BET techniques. It was found that the polydispersity index of polyethylene could be adjusted over a wide range of 2-15 through regulating the [Mg]/[Si] ratio and polymerization temperature, and especially when the [Mg]/[Si] ratio was unity, the polydispersity index could be reached over 14. The results showed the addition of hydrogen caused to decrease the activity of catalyst, while; increasing monomer pressure caused to have an increase in activity.
کلیدواژه ها:
Polyethylene-Ziegler-Natta catalyst- supported catalyst- slurry polymerizationmolecular weight distribution
نویسندگان
A. Rouhisefat
Polymer Engineering Department, Amirkabir University of Technology, Tehran, Iran
m Vatankhah
Polymer Engineering Department, Amirkabir University of Technology, Tehran, Iran
s Pourmahdian
Polymer Engineering Department, Amirkabir University of Technology, Tehran, Iran