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tuning the short chain branch distribution of ethylene and 1-hexene copolymers by sio2-supported silyl chromate catalyst with different al-alkyl co-catalysts
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نویسنده
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zhao ning ,cheng ruihua ,dong qi ,he xuelian ,liu zhen ,zhang shiliang ,terano minoru ,liu boping
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منبع
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polyolefins journal - 2014 - دوره : 1 - شماره : 2 - صفحه:93 -105
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چکیده
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Sio2supported silyl chromate catalyst is an important industrial catalyst for production of high grade hdpepipe materials. the control of the short chain branch (scb) distribution using this catalyst system is still a greatchallenge. in this work, ethylene and 1hexene copolymers were synthesized using sio2supported silyl chromatecatalyst combined with triisobutylaluminium (tiba), triethylaluminium (tea) and mixed tiba/tea at molarratio 1:1 (tiba/tea/1:1) as three different alalkyl cocatalysts.the temperature rising elution fractionation(tref) and successive selfnucleation and annealing (ssa, by dsc) methods were combined to analyze the shortchain branch distribution (scbd) of these ethylene/1hexene copolymers. the results showed that different typesof cocatalyst had a great influence on scbd of ethylene/1hexene copolymers. the copolymer produced withtiba showed better scbd than the copolymer produced with tea, and the copolymer produced with tiba/tea/1:1 showed a scbd in between those with tiba and tea.
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کلیدواژه
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al-alkyl co-catalyst ,polymerization kinetics ,sio2-supported silyl chromate catalyst ,short chain branch distribution ,ethylene/1-hexene copolymerization
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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, japan advanced institute of science and technology, school of materials science, japan, 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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