CUI, Nannan
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences)
,
ZHANG, Zhicheng
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences)
,
LI, Huayi
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences)
,
CHEN, Shangtao
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences)
,
ZHANG, Xiaofan
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences)
,
KE, Yucai
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences)
,
HU, Youliang
(Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sci)
MgCl2-supported Ziegler-Natta (Z-N) catalysts containing three different Lewis bases (diisobutyl phthalate, 9,9-bis (methoxymethyl) fluorine and 1,1-bis (methoxymethyl) cyclobutane) as internal donors were prepared for propylene polymerization. The relationship between the structure of donors and th...
MgCl2-supported Ziegler-Natta (Z-N) catalysts containing three different Lewis bases (diisobutyl phthalate, 9,9-bis (methoxymethyl) fluorine and 1,1-bis (methoxymethyl) cyclobutane) as internal donors were prepared for propylene polymerization. The relationship between the structure of donors and the performance of catalysts were investigated. The Z-N catalyst containing 9,9-bis(methoxymethyl) fluorine as internal donor and the related compounds were characterized by FTIR spectroscopy. It was found that the internal donor in the MgCl2/TiCl4/ Donor catalyst system was directly coordinated to MgCl2. The introduction of internal donors decreased the Ti content in the catalyst system, increased the catalytic activity and narrowed the molecular mass distribution of polymers obtained. The stereospecificity of Z-N catalysts greatly depended on the structure of electron donors. A model of muhi-active sites on heterogeneous Z-N catalyst was proposed to explain the experimental results.
MgCl2-supported Ziegler-Natta (Z-N) catalysts containing three different Lewis bases (diisobutyl phthalate, 9,9-bis (methoxymethyl) fluorine and 1,1-bis (methoxymethyl) cyclobutane) as internal donors were prepared for propylene polymerization. The relationship between the structure of donors and the performance of catalysts were investigated. The Z-N catalyst containing 9,9-bis(methoxymethyl) fluorine as internal donor and the related compounds were characterized by FTIR spectroscopy. It was found that the internal donor in the MgCl2/TiCl4/ Donor catalyst system was directly coordinated to MgCl2. The introduction of internal donors decreased the Ti content in the catalyst system, increased the catalytic activity and narrowed the molecular mass distribution of polymers obtained. The stereospecificity of Z-N catalysts greatly depended on the structure of electron donors. A model of muhi-active sites on heterogeneous Z-N catalyst was proposed to explain the experimental results.
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