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how can ph value during catalyst preparation affect the performance of vanadium-modified (sio2/mgo/ mgcl2)•ticlx ziegler-natta polyethylene catalysts
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نویسنده
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fu ting ,cheng ruihua ,he xuelian ,liu zhen ,tian zhou ,liu boping
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منبع
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polyolefins journal - 2018 - دوره : 5 - شماره : 1 - صفحه:31 -45
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چکیده
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Vanadium-modified (sio2/mgo/mgcl2)•ticlx ziegler-natta catalysts were prepared through co-impregnation of water-soluble magnesium and vanadium salts under different ph values. several key factors such as ph value of co-impregnation solution during catalyst preparation, catalyst performances including catalytic activity, ethylene/1-hexene copolymerization and hydrogen response were investigated. it is found that the components, structures and performance of the catalysts are obviously affected by changing the ph value (ph=5, 7 and 9) of co-impregnation solution. an appropriate ph value (ph=7) can maximize catalytic activity and hydrogen response, while lower ph value (ph=5) is beneficial to the 1-hexene incorporation. the gpc results show that the polymers obtained have high average molecular weight.
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کلیدواژه
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ziegler-natta catalysts ,polyethylene ,polymerization kinetics
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آدرس
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east china university of science and technology, state key laboratory of chemical engineering, china, east china university of science and technology, state key laboratory of chemical engineering, china, east china university of science and technology, state key laboratory of chemical engineering, china, east china university of science and technology, state key laboratory of chemical engineering, china, east china university of science and technology, state key laboratory of chemical engineering, china, east china university of science and technology, state key laboratory of chemical engineering, china
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پست الکترونیکی
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boping@ecust.edu.cn
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Authors
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