苯乙烯间规聚合过程的搅拌功耗研究

Study on Power Consumption of Agitation in Syndiospecific Polymerization of Styrene

采用新型均相茂金属催化剂体系[CpTi(OPh)3/MAO/TIBA]催化苯乙烯间规聚合,研究了主催化剂浓度、惰性介质种类及加入量对聚合过程的影响,尤其是聚合中搅拌功耗的变化,并分析了搅拌功耗、结晶和聚合之间的关系。研究表明,间规聚苯乙烯在聚合过程中不断结晶,当固相质量分数高于第一临界点(Xc1≈15%)后聚合体系的搅拌功耗迅速上升,在第二临界点(Xc2≈40%)处搅拌功耗出现峰值;决定搅拌功耗最本质的因素是体系的固相体积分数,产物颗粒形态的规整性直接影响了体系的固相体积分数。

The syndiospecific polymerization of styrene catalyzed by homogeneous metallocene catalytic system[Cp*Ti(OPh)_3/MAO/TIBA] was carried out in 100ml branched tube with double ~helicalanchor agitator. The effects of metallocene catalyst concentration and different inert media on ~polymerizati on process, especially on the variation of agitation power were investigated. The relationship among ~agitation , crystallization and polymerization was analyzed. The experimental results indicated that the ~original polymer was crystallized during polymerization. The power consumpation of agitation went up rapidly above the critical solid weight ~fraction ≈15% and it reached a peak value when solid weight ~fraction was around 40%.It was found that the main factor of determininging the power consumption of ~agitation was volume weight fraction of the system, which was directly affected by the morphology of sPS particles formed during the polymerization process.