Abstract:

An efficient ethylene polymerization Zieglar-Natta（Z-N）catalyst was prepared，in which ketone and/or ester was used as internal electron donor compound. The influence of internal electron donor on catalytic performance was analyzed by means of FTIR，which indicated that the electron donating ability is in the order of DIBP>(DIBP/ACAC)>ACAC. Polyethylenes obtained with these three catalysts were characterized by means of DSC and GPC. The Z-N catalyst bearing internal electron donors composed of ketone and ester component demonstrated higher polymerization activity，more obvious “co-monomer effect”，and the polymer produced showed relative broader molecular weight distribution than that with single internal electron donor catalyst.

摘要：

用酮类和二酯类为复配内给电子体制备了一种高效乙烯聚合催化剂，用FTIR分析了单个内给电子和复配内给电子体对催化剂结构的影响，结果表明3种催化剂中给电子性能为邻苯二甲酸>邻苯二甲酸/二异丁酯乙酰丙酮>二异丁酯乙酰丙酮。用凝胶渗透色谱（GPC）和差示扫描量热仪（DSC）对3种催化剂所制备的聚乙烯进行了表征，与单个内给电子体催化剂制备的聚乙烯相比，复配内给电子体催化剂所制备的聚乙烯具有更高的聚合活性，更明显的“共单体效应”和更宽的相对分子量分布。