由Mg（nBu）_2制备的载体及催化剂的组成、结构与性能的研究

STUDY ON THE CHEMICAL COMPOSITON, STRUCTURE AND PROPERTIES OF SUPPORTS AND CATALYSTS PREPARED FROM Mg(nBu)_2

详细讨论了载体ＳＮ，ＳＭ，ＳＤ和ＳＰ（它们分别代表在制备载体时，不加酯，加单酯，加双酯与加ＰＯＣｌ３所生成的载体）以及与其相对应的催化剂ＣＮ，ＣＭ，ＣＤ，和ＣＰ的组成、结构与性能的关系．确定了邻苯二甲酸二正了酯与Ｍｇ（ｎＢｕ）２的反应机理．ＩＲ研究表明（３）式中化合物（Ⅱ）和（Ⅲ）大部分能与ＳＤ载体的ＭｇＣｌ２配位生成络合物，而化合物（Ⅱ）和（Ⅲ）只以游离和物理吸附形式存在于ＳＰ载体的ＭｇＣｌ２之中．ＸＲＤ谱图表明，ＳＤ载体是无定形ＭｇＣｌ２载体ＳＮ和ＳＭ的比表面积远大于载体ＳＤ和ＳＰ，但经ＴｉＣｌ４处理后后者的比表面积大幅度增加．由ＸＲＤ谱图看出，无定形ＭｇＣｌ２载体，经ＴｉＣｌ４处理可结晶成为高活性、高定向度的丙烯聚合催化剂．从ＩＲ谱图也看出，催化剂中的酯只同ＭｇＣｌ２发生络合作用而没有同ＴＩＣｌ４发生络合反应．

he chemical composition,structure and properties of supports and catalysts were discussed.The reaction mechanism of the dibutyl phthalate with Mg(nBu)2 was also researched.The components(Ⅱ)and (Ⅲ)in formula(3)are complexed with MgCl2 in the support SD(prepared by using dibutyl phthalate), but they are present in support SP (prepared by using POCl3) in the form of free and physical adsorption. XRD pattern showed that the support SD is amorphous MgCl2 .The surface area of supports SN(prepared without ester)and Sa (prepared by using ethyl benzoate) is much greater than that of supports SD and SP, but the surface area of supports SD and SP is greatly increased after treating with TiCl4 The catalyst with high activity and good stereospecificity can be prepared by using amorphous MgCl2 and -TiCl4.IR spectra showed that the ester in supported catalyst is only complexed with MgCl2.The polymerization activity for ethylene is less than that for propene.