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采用含氮双膦配体与无水氯化钴反应可制得一系列相应的(P^N^P)钴配合物,并研究了该系列钴配合物对苯乙烯聚合的催化性能.在助催化剂倍半氯化乙基铝(EASC)的活化下,该系列钴配合物对甲苯中的苯乙烯溶液聚合表现出高的催化活性(可达5.44×105g(PS)·mol-1(Co)·h-1).通过对不同苯乙烯单体用量、助催化剂用量(Al/Co摩尔比)、聚合温度以及催化剂的配体环境等的研究,详细考察了这些因素对聚合反应和聚合产物性能的影响.通过凝胶渗透色谱法(GPC)和核磁共振碳谱(13C-NMR)表征了所得聚合产物的分子量及分子量分布和微观结构,分析结果表明,所得聚苯乙烯具有较低的分子量(Mn=2000~5900)和较窄的分子量分布(1.75~2.05),其微观结构是无规的.
A series of corresponding (P ^ N ^ P) cobalt complexes were prepared by the reaction of nitrogenous bisphosphine ligand with anhydrous cobalt chloride. The catalytic properties of the series of cobalt complexes for styrene polymerization were studied. Under the activation of EASC, the series of cobalt complexes showed high catalytic activity for the polymerization of styrene in toluene (up to 5.44 × 105g (PS) · mol-1 (Co) · H-1) .Through the study of the amount of different styrene monomer, the amount of cocatalyst (Al / Co molar ratio), the polymerization temperature and the ligand environment of the catalyst, the effects of these factors on the polymerization reaction and the properties of the polymerization product The molecular weight, molecular weight distribution and microstructure of the obtained polymer were characterized by gel permeation chromatography (GPC) and nuclear magnetic resonance (13C-NMR) spectroscopy. The results showed that the obtained polystyrene had lower molecular weight Mn = 2000-5900) and narrow molecular weight distribution (1.75-2.05), the microstructure is random.