高分子量聚氯乙烯的形态、流变与加工性能  

THE MORPHOLOGY,RHEOLOGY AND PROCESSING PROPERTIES OF HIGH MOLECULAR WEIGHT POLY(VINYL CHLORIDE)

作　　者：华幼卿[1] 斯钦达来[1] 

机构地区：[1]北京化工学院高分子系

出　　处：《高分子材料科学与工程》1994年第4期74-78,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金

摘　　要：采用程序升温Ｂｒａｂａｎｄｅｒ转矩－流变仪研究、比较了两种高分子量聚氯乙烯树脂（分子量相同）及其增塑体系在相同剪切应力作用下的熔融过程。采用毛细管流变仪和Ｂｒａｂａｎｄｅｒ挤出－流变仪研究了上述增塑体系的流变行为和挤出性能。结果表明，树脂颗粒的疏松程度越好，颗粒表面无皮膜包覆，粉粒破碎成聚结体和初级粒子的温度越低，这些微观层次的粒子相互粘连直至形成分子熔体的熔融温度越低，其增塑体系的熔融温度也越低，挤出速度越大，加工性能越好。结果还表明，树脂颗粒形态越疏松，随着剪切速率增加，表观粘度下降越显著。The Brabander torque-rheometer with proprammable elevating temperature was used to study and compare the melting processes of two high molecular weight poly(vinyl chloride) resins(each having same molecular weight) and their plasticized systems in same shear stress.The capillary rheometer and Brabander extrution-rheometer were applied to study the rheological behaviour and extruded properties of above plasticized systems. The results illustrate that the looser particle structure of the resins,the lower temperature to breaking the grain into agglomerate and primary particle as well as of sticking these microscopic particle together until the molecular melt is formed,and the lower melting temperature and faster rate of extrusion of their plasticized systems.The results the show that when increasing shear rate, the particle morphology of resins is looser,the apparent viscosity is markedly dropped .

关 键 词：高分子量 聚氯乙烯 制造 流变性 

分 类 号：TQ325.301[化学工程—合成树脂塑料工业]