文献类型：期刊文献

英文题名：Novel SiO2-Supported Chromium Oxide(Cr)/Vanadium Oxide(V) Bimetallic Catalysts for Production of Bimodal Polyethylene

作者：Cheng, Ruihua[1];Xue, Xin[1];Liu, Weiwei[1];Zhao, Ning[1];He, Xuelian[1];Liu, Zhen[1];Liu, Boping[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：9

期号：5

起止页码：462

外文期刊名：MACROMOLECULAR REACTION ENGINEERING

收录：;EI(收录号：20152000858483);WOS:【SCI-EXPANDED(收录号:WOS:000366061100010)】；

基金：We gratefully thank the financial support by the National Natural Science Foundation of China (no. 21104019 and 21274040), the National High Technology Research and Development Program 863 (2012AA040306). This work is also financially supported by the Fundamental Research Funds for the Central Universities, research program of Introducing Talents of Discipline of university (B08021) and research program of the State Key Laboratory of Chemical Engineering.

语种：英文

外文关键词：bimodal molecular weight distribution; copolymerization; Cr-V bimetallic catalyst; kinetics (polym.); short chain branch distribution (SCBD)

摘要：Novel SiO2-supported Cr-V bimetallic oxides catalysts, which were capable of one-pot synthesizing polyethylene with bimodal molecular weight distribution, had been successfully developed. These catalysts were prepared with a simple introduction of vanadium oxide onto the traditional Phillips CrOx/SiO2 catalyst. The polymerization activity over the Cr-V bimetallic catalysts was significantly improved compared with the V-free Phillips CrOx/SiO2 catalyst. Moreover, the bimodal ethylene/1-hexene copolymer prepared by the novel catalyst showed a better short chain branch distribution with more 1-hexene comonomer inserted into the PE chains with high molecular weight, which would be favorable for the long term mechanical properties of the bimodal PE as potential high grade pipe materials.