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Polyolefins Journal، جلد ۵، شماره ۱، صفحات ۱-۱۳
عنوان فارسی
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عنوان انگلیسی Effects of Ti/Mg molar ratio on bi-supported SiO2/MgCl2 (ethoxide type)/TiCl4 catalysts in ethylene homopolymerization and ethylene/1-hexene copolymerization
چکیده انگلیسی مقاله SiO2/MgCl2 (ethoxide type)/TiCl4 Ziegler-Natta catalysts for use in ethylene polymerization and ethylene/1-hexene copolymerization have been prepared using silica with a supported layer of magnesium ethoxide (Mg(OEt)2) as a catalyst precursor, followed by treating with TiCl4 at different Ti/Mg molar ratios, which showed significant effects on the active centers and pore structures of the catalysts. The formation amount of β-MgCl2 carrier increased to a maximum with increasing the Ti/Mg molar ratio from 1.50 to 2.25, and then decreased with the further increasing of Ti/Mg molar to 2.50. When the Ti/Mg molar ratio reached 2.25, the catalyst showed the best performance of polymerization, which could be attributed to the most active centers, high surface area and loose surface structure, mainly owing to the high conversion of Mg(OEt)2 to β-MgCl2. The polymers obtained showed medium and high molecular weight (Mw) with medium molecular weight distribution (MWD). In contrast to the conventional Mg(OEt)2-based ZN catalysts, the sphericity of particles was easy to control in this bi-supported catalyst. Furthermore, the prepared catalysts exhibited rather high activity, good copolymerization ability and hydrogen response.
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نویسندگان مقاله liang zhu |
state key laboratory of chemical engineering, east china university of science and technology, meilong road 130, shanghai 200237, china.

xuelian he |
state key laboratory of chemical engineering, east china university of science and technology, meilong road 130, shanghai 200237, china.

ruihua چنگ |
state key laboratory of chemical engineering, east china university of science and technology, meilong road 130, shanghai 200237, china.

zhen liu |
state key laboratory of chemical engineering, east china university of science and technology, meilong road 130, shanghai 200237, china.

ning zhao |
state key laboratory of chemical engineering, east china university of science and technology, meilong road 130, shanghai 200237, china.

boping liu |
state key laboratory of chemical engineering, east china university of science and technology, meilong road 130, shanghai 200237, china.

نشانی اینترنتی http://poj.ippi.ac.ir/article_1470_7ad37d474306342d0c5122912c2889d4.pdf
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زبان مقاله منتشر شده en
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