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