含芳香双酯高效催化剂进行丙烯聚合及其动力学的研究

Studies on Propylene Polymerization and Polymerization Kinetics Under Highly Active Catalyst Comprising Phthalic Ester

采用多种芳香双酯作为电子给予体制备了丙烯聚合高效催化剂,该催化剂具有高活性、聚合反应平稳、产物等规度高等特征.研究了多种芳香双酯和外加各种烷基硅氧烷对丙烯聚合的作用,测定了聚合反应动力学曲线,确定了聚合动力学方程.用扫描电镜研究了催化剂的形态,表明双酯组份能使催化剂结合得较紧密;对聚合产物的结构用DSD、红外光谱进行了表征.

The polymerization of propylene under highly active catalyst comprising phthalic esters 1,2-C6H4(COOEt)2,1,2-C6H4(COOCH2CH=CH2)2,1,2-C6H4(COOBu)2 as electron-donors has been studied.It was found that the PP tacticity would raise with increasing phthalic esters,and the catalytic activity decreases while the PP tacticity increases.By adding silicon compounds PhSi(OEt)3,Ph2Si(OMe)2,Ph2Si(OEt)2,(CH3)2Si(OEt)2,there are almost the same results.The kinetics of propylene polymerization has been investigated.The polymerization rate equation in good agreement with experimental evidence is expressed as:Vt-Va=(V0-Va)e-βt,The change in morphology of the catalyst was studied before and after adding phthalate ester by SEM.