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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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[N^N^O]钴配合物催化丁二烯立体选择性聚合的研究
DOI: 10.11777/j.issn1000-3304.2015.15193, PP. 1486-1492
Keywords: 钴,倍半乙基氯化铝,丁二烯,聚合,顺式含量
Abstract:
合成并表征了一系列带有[2-(4,5-二苯基-2-咪唑基)-1-苯亚胺基]苯酚配体([N^N^O]三齿配体)的二氯化钴配合物(1~4),并研究了这些配合物对丁二烯溶液聚合的催化性能.研究结果表明,助催化剂的种类对丁二烯聚合的催化活性和产物性能有显著的影响,倍半乙基氯化铝(EASC)为最佳的助催化剂.在EASC的活化作用下,该催化体系引发丁二烯单体聚合,15min内丁二烯单体的转化率可达92.7%,产物聚丁二烯中顺式1,4-结构的含量高达97.4%.并详细研究了助催化剂的用量、聚合的温度、配体上不同取代基等对丁二烯聚合行为的影响,包括丁二烯单体的转化率、产物聚丁二烯的分子量与分子量分布及微观结构.通过凝胶渗透色谱法(GPC)对聚合产物的分子量及分子量分布进行了表征,核磁共振氢谱(1H-NMR)和碳谱(13C-NMR)分析结果表明所得聚合物具有高的顺式1,4-结构含量(97%左右).
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