聚醚醚酮的黏度特性及其复合材料加工工艺窗口研究

Research on the viscosity properties of poly-ether-ether-ketone and the processing window for its composites

为了探究聚醚醚酮(Poly-ether-ether-ketone,PEEK)的黏度特性,为PEEK基复合材料制备工艺的设计提供参考,采用旋转流变仪考察在一定剪切速率下温度和时间对PEEK黏度的影响,创建PEEK熔体的黏度模型,模拟在有氧条件下PEEK熔体的黏度与时间和温度的关系。结果表明:在653.15~673.15 K温度范围内,随着测试时间的增加,PEEK熔体的黏度先降低后升高,表明PEEK熔体存在由下降到增大的临界黏度,到达临界黏度的时间与温度成反比例关系。构建的模型能预测在有氧条件下PEEK熔体的黏度随温度时间的变化趋势,由此可确立加工工艺窗口,从而为PEEK基复合材料生产中的加工工艺设计提供依据。

To investigate the viscosity characteristics of poly-ether-ether-ketone(PEEK)and provide reference for the design of the processing of PEEK composites,a rotary rheometer was used to investigate the effect of temperature and time on the viscosity of PEEK at a certain shear rate,and a viscosity model of PEEK melt was proposed to simulate the relationship between the viscosity of PEEK melt and time and temperature under aerobic conditions.The results show that within the temperature range of 653.15~673.15 K,the viscosity of PEEK melt first decreases and then increases with the increase of testing time,indicating that there is a critical viscosity of PEEK melt from decrease to increase.The time to reach the critical viscosity is inversely proportional to temperature.The model built allows to predict the trend of viscosity of PEEK melt with temperature and time and define a processing window,so as to provide basis for the processing design during the manufacturing of PEEK composites.