TiCl_4-Mg(OC_2H_5)_2催化乙烯聚合和形态学研究Ⅱ.预聚合对聚合物颗粒形态的修正  

Ethylene Polymerization and Particle Morphology with TiCl_4-Mg(OC_2H_5)_2 Catalyst II. The Effect of Prepolymerization on the Modification of Morphology of Polymer Particles

作　　者：阳永荣[1] 叶志斌[1] 任晓红[1] 

机构地区：[1]浙江大学化工系,浙江杭州310027

出　　处：《石油化工》2002年第1期21-23,共3页Petrochemical Technology

基　　金：国家自然科学基金资助项目 ( 2 930 6 0 45 2 970 6 0 10 )

摘　　要：在较低的温度和乙烯分压下进行预聚合 ,然后提高温度和压力进行后续的聚合实验 ,考察了预聚合条件对催化剂聚合动力学和聚合物颗粒形态的影响。发现预聚合可以提高催化剂的活性 ,预聚合时间越长 ,催化剂活性提高越多。通过SEM分析发现 ,预聚合显著改善了聚合物的颗粒形态。由于聚合物颗粒中的线团状形态结构消失 ,聚合物粉体的堆密度显著上升。The influence of prepolymerization on polymerization kinetics and morphology of polymer particles was investigated.It was found that prepolymerization led to higher activity of the catalyst and significantly improved the morphology of polymer particles.The clew structure of polymer was replaced by other microstructures when the catalysts with higher porosity underwent prepolymerization.The longer prepolymerization time is, the higher will be the polymerization activity of the catalyst and higher bulk density of the powder.It is possible to achieve higher catalyst activity and higher bulk density of polymer powder simultaneously by optimizing prepolymerization condition.

关 键 词：聚烯烃催化剂 预聚合 聚合物颗粒形态 聚合动力学 

分 类 号：TQ316.314[化学工程—高聚物工业]