文献类型：期刊文献

英文题名：Analysis of Ethylene/1-Olefin Copolymers Made with Ziegler-Natta Catalysts by Deconvolution of Molecular Weight and Average Short Chain Branching Distributions

作者：Chen, Keran[1,2];Mehdiabadi, Saeid[1];Liu, Boping[2];Soares, Joao B. P.[1]

机构：[1]Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2016

卷号：10

期号：3

起止页码：206

外文期刊名：MACROMOLECULAR REACTION ENGINEERING

收录：;EI(收录号：20161102079927);WOS:【SCI-EXPANDED(收录号:WOS:000379158700004)】；

基金：The authors thank the Chinese Scholarship Council, the National Natural Science Foundation of China (21406061), and Natural Sciences and Engineering Research Council of Canada (NSERC) for their financial support.

语种：英文

外文关键词：LLDPE; MWD deconvolution; polyethylene; polymer reaction engineering; Ziegler-Natta

摘要：In this article a systematic method is proposed to deconvolute the time-dependent molecular weight distributions (MWD) and average comonomer fraction profiles of ethylene/1-olefin copolymers made with heterogeneous Ziegler-Natta catalysts. These distributions with a high-temperature gel permeation chromatography equipped with an infrared detector at four different polymerization times have been measured and used this information to infer how the fractions of polymer made on each site type varied with polymerization time. The model estimates here the minimum number of active site types needed to describe these copolymers, the MWD of polymer populations made on each site type, and their average comonomer fractions. This method is useful to quantify the microstructure of olefin copolymers made with multiple site type catalysts using the least number of adjustable parameters.