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张春庆
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副教授   博士生导师   硕士生导师

性别: 男

毕业院校: 大连理工大学

学位: 博士

所在单位: 化工学院

学科: 高分子材料. 高分子化学与物理. 功能材料化学与化工

办公地点: 西部校区化工实验楼A303

联系方式: 办公室电话:84986101,13610963135

电子邮箱: zhangchq@dlut.edu.cn

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Methylaluminoxane-Activated Neodymium Chloride Tributylphosphate Catalyst for Isoprene Polymerization

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论文类型: 期刊论文

发表时间: 2014-04-15

发表刊物: JOURNAL OF APPLIED POLYMER SCIENCE

收录刊物: SCIE、EI、Scopus

卷号: 131

期号: 8

ISSN号: 0021-8995

关键字: catalysts; rubber; addition polymerization

摘要: The polymerization of isoprene was examined by using a novel binary catalyst system composed of neodymium chloride tributylphosphate (NdCl3 center dot 3TBP) and methylaluminoxane (MAO). The NdCl3 center dot 3TBP/MAO catalyst worked effectively in a low MAO level ([Al]/[Nd]=50) to afford polymers with high molecular weight (M-n approximate to 10(5)), narrow molecular weight distribution (M-w/M-n=1.4-1.6), and high cis-1,4 stereoregularity (> 96%). The catalytic activity increased with an increasing [Al]/[Nd] ratio from 30 to 100 and polymerization temperature from 0 to 50 degrees C, while the M-n of polymer decreased. The presence of free TBP resulted in low polymer yield. Polymerization solvent remarkably affected the polymerization behaviors; the polymerizations in aliphatic solvents (cyclohexane and hexane) gave polymer in higher yield than that in toluene. The M-w/M-n ratio of the producing polymer remained around 1.5 and the gel permeation chromatographic curve was always unimodal, indicating the presence of a single active site in the polymerization system. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40153.

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