期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 111, 期 5, 页码 2625-2629出版社
WILEY
DOI: 10.1002/app.29337
关键词
catalysts; polyolefins; Ziegler-Natta polymerization
资金
- Program for New Century Excellent Talents in University
- Program for New Century Excellent Talents in Heilongjiang Provincial University [NCET-06-010]
Two novel magnesium chloride supported, vanadium-based Ziegler-Natta catalysts with 9,9-bis(methoxymethyl)fluorene and di-i-butyl phthalate as internal donors were prepared and used in the copolymerization of ethylene and propylene. The catalytic behaviors of these catalysts were investigated and compared with those of traditional magnesium chloride supported, vanadium-based catalysts without internal donors. Differential scanning calorimetry, gel permeation chromatography, and C-13-NMR spectroscopy analysis were performed to characterize the melting temperatures, molecular weights, and molecular weight distributions as well as structures and compositions of the products. The copolymerization kinetic results indicated that the novel catalyst with 9,9-bis(methoxymethyl)fluorene as an internal donor had the highest catalytic activity and optimal kinetic behavior in ethylene-propylene copolymerization with an ethylene/propylene molar ratio of 44/56. Low-crystallinity and high-molecular-weight copolymers were obtained with these novel Magnesium chloride Supported, vanadium-based catalysts. The reactivity ratio data indicated that the catalytic systems had a tendency to produce random ethylene-propylene copolymers. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2625-2629, 2009
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据