【摘要】 采用理论分析与实验相结合的方法对聚苯乙烯（PS）/超临界 CO₂（SCCO₂）泡体系的黏度进行了研究。对塑料熔体中气体对黏度的影响以及 PS/SCCO₂ 发泡体系的黏度进行了理论分析,得出带有发泡剂的塑料熔体的黏度是温度、剪切速率、压力和熔体中所含发泡剂种类、浓度及分布状态等的函数;根据实验及数据分析结果整理建立了PS/SCCO₂发泡体系的黏度预测模型η=10^α/βγ^n-1,并与实验测得黏度进行了比较,结果表明,误差不超过5%,该模型可以很好地预测 PS/SCCO₂发泡体系的黏度。更多还原

【Abstract】 This paper investigated the viscosity of PS/SCCO₂ foaming system.By analyzing the influ- ence of the type,concentration and distribution of gas,temperature,and shearing rate on the melt vis- cosity,a model of PS/SCCO₂ foaming system was formulated:η=10^α/βγ^n-1.Compared with experi- mental data,the prediction error was within 5%.It verified that the viscosity of foaming system is lower than that of neat polymer melt in the same condition.更多还原