化工学报2017，Vol.68Issue(4)：1434-1441,8.DOI:10.11949/j.issn.0438-1157.20161119
预接触温度对聚丙烯DQC球形催化剂聚合性能的影响
Effect of pre-contact temperature on performance of DQC spherical catalyst in propylene polymerization
张天一 1夏先知 1刘月祥1
作者信息
- 1. 中国石油化工股份有限公司北京化工研究院,北京 100013
- 折叠
摘要
Abstract
The pre-contact temperature of DQC catalyst system on liquid bulk polymerization of propylene was studied using cyclohexyl methyl dimethoxy silane (C-donor) as external donor. The results indicated that increase of pre-contact temperature caused decrease of polymerization activity of DQC catalyst, which yielded polymers with decreased melt index but increased isotactic index and fine powder content. Gel permeation chromatography (GPC) results showed that increase of pre-contact temperature broadened molecular weight distributions and decreased both number and weight average molecular weights. Differential scanning calorimetry (DSC) results exhibited that melting temperature, melting enthalpy, crystallization enthalpy, and crystallinity of polypropylenes increased to various degrees.13C NMR results showed an increase of stereoregular sequences of triad mm and pentad mmmm with increase of pre-contact temperature.关键词
预接触温度/DQC球形催化剂/聚丙烯/丙烯聚合Key words
pre-contact temperature/DQC spherical catalyst/polypropylene/propylene polymerization分类
化学化工引用本文复制引用
张天一,夏先知,刘月祥..预接触温度对聚丙烯DQC球形催化剂聚合性能的影响[J].化工学报,2017,68(4):1434-1441,8.
