以新型环烷氧基硅烷化合物为外给电子体的齐格勒-纳塔催化剂的氢敏感性研究

Study on Hydrogen Sensitivity of Ziegler⁻Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor.

作者信息

Li Hongming, Wang Jing, He Lei, Nan Feng, Wang Fan, Yang Wantai, Zhang Mingge, Sun Tianxu, Huang Qigu, Yi Jianjun

机构信息

State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, the College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Petrochemical Research Institute, PetroChina, Beijing 102206, China.

出版信息

Polymers (Basel). 2016 Dec 16;8(12):433. doi: 10.3390/polym8120433.

DOI:10.3390/polym8120433

PMID:30974714

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6432079/

Abstract

Two novel cycloalkoxy silane compounds (ED1 and ED2) were synthesized and used as the external electron donors (EEDs) in Ziegler⁻Natta catalysts with diethyl 2,3-diisopropylsuccinate as internal electron donor. The results indicated that the Ziegler⁻Natta catalysts using ED1 and ED2 as EEDs had high catalytic activities and good stereoselectivities. The melt flow rate (MFR) and gel permeation chromatography (GPC) results revealed that the obtained polypropylene has higher MFR and lower average molecular weights than the commercial EED cyclohexyl methyl dimethoxysilane. The differential scanning calorimetry (DSC) results indicated that new isospecific active centers formed after the introduction of new external donors. The work implied that the novel EEDs could improve the hydrogen sensitivities of the catalyst system and obtain polymers with high melt flow rate.

摘要

合成了两种新型环烷氧基硅烷化合物（ED1和ED2），并将其用作齐格勒-纳塔催化剂中的外给电子体（EED），其中二乙基2,3-二异丙基琥珀酸酯为内给电子体。结果表明，以ED1和ED2作为EED的齐格勒-纳塔催化剂具有较高的催化活性和良好的立体选择性。熔体流动速率（MFR）和凝胶渗透色谱（GPC）结果表明，所得聚丙烯比市售EED环己基甲基二甲氧基硅烷具有更高的MFR和更低的平均分子量。差示扫描量热法（DSC）结果表明，引入新的外给电子体后形成了新的等规活性中心。该工作表明，新型EED可以提高催化剂体系的氢敏感性，并获得具有高熔体流动速率的聚合物。