非相容聚合物体系熔融共混过程中分散相粒径变化的预测  

PREDICTION OF DROPLET SIZE IN DISPERSED PHASE OF IMMISCIBLE POLYMER BLENDS DURING MOLTEN MIXING

作　　者：邹建龙[1] 沈宁祥[1] 盛京[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《高分子学报》2002年第1期53-57,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金资助项目 (基金号 5 97330 70 )

摘　　要：以PS PP共混体系为研究对象 ,研究了非相容聚合物体系混炼过程中分散相含量、剪切速率及聚合物弹性等对分散相粒径变化的影响 ,对平衡态分散相粒径的变化进行了预测 ,并对其计算公式进行了新的改进 .研究表明 ,分散相浓度较低时 ,分散相粒径与分散相体积分数呈线性增长关系 ;在较高浓度时 ,分散相粒子的聚结作用明显 ,公式应加以修正 .实验中还观察到 ,对于PS(连续相 ) PP(分散相 )共混体系 ,随着剪切速率的增大 ,分散相粒径先不断减小 ,达到一极小值后 。From a theoretical background similar to that of Ghodgaonkar's, using a general description of breakup and the Smoluchowski theory of coalescence of droplets, a relation has been derived for estimating the dispersed phase droplet size during mixing of polymer blends in the steady state. The influences of dispersed phase concentration, shear rate and elasticity of polymers are studied. In a less concentrated system, the diameter of the droplets increases linearly with their concentration. In a more concentrated system, the coalescence effects become increasingly important, the simultaneous collisions of three and more droplets should be considered and the drop diameter versus concentration dependence becomes more complicated. In PS (dispersed)/PP(matrix) blend system, it was observed that the drop diameter continued to decrease up to a maximum shear rate of 128 s(-1). In PS(matrix)/PP (dispersed) blend system, however, as the shear rate increased, the drop diameter initially decreased. At a critical shear rate, the diameter reached a minimum value, and beyond it, the diameter increased with shear. The elasticity of polymers plays a crucial role.

关 键 词：聚苯乙烯 粒径变化 PS/PP体系 熔融共混 分散相 粒径预测 非相容聚合物体系 混炼过程 聚丙烯 

分 类 号：TQ316[化学工程—高聚物工业]