文献类型：期刊文献

英文题名：Exploring Si/Mg Composite Supported Ziegler-Natta Ti-based Catalysts for Propylene Polymerization

作者：Zhu, Wei[1];Tian, Zhou[2];Cheng, Rui-hua[1];He, Xue-lian[1];Liu, Zhen[1];Zhao, Ning[1];Liu, Bo-ping[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Minist Educ, Key Lab Adv Control & Optimizat Chem Proc, Shanghai 200237, Peoples R China

年份：2017

卷号：35

期号：12

起止页码：1474

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20212810632403);WOS:【SCI-EXPANDED(收录号:WOS:000413686300004)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 21406061 and 21674036), the Major State Basic Research Development Program of China (No. 2014CB239503) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Polypropylene; Ziegler-Natta catalyst; External donor; Internal donor; Kinetic curves

摘要：A series of (SiO2/MgO/ID/MgCl2)center dot TiCl (x) Ziegler-Natta catalysts for propylene polymerization has been prepared with a new method. These catalysts were synthesized using soluble Mg-compounds as the Mg-source and the preparation progress was relatively simple. The catalyst could copy the spherical shape of the carrier very well. The propylene polymerization results showed that the catalyst revealed the best activity with 9,9-di(methoxymethyl)fluorene (BMMF) as internal donor at 50 degrees C with the optimal molar ratio Al/Ti = 5, which was much lower than what the industrial polypropylene catalyst used (at least molar ratio Al/Ti = 100), resulting in great cost saving. Additionally, the polymerization kinetics of the catalyst exhibited very stable property after achieving a relatively high value. These catalysts possessed rather high activity and good hydrogen response. The isotactic index (II.) value of the PP products could be higher than 98% in the presence of both internal and external electron donors. Moreover, temperature rising elution fractionation method was used to understand the influence of donors and H-2 on the properties of the PP products.