PS在低频振动场中流变行为的研究

Research of Rheological Behavior of PS Melt in Low Frequency Vibrating Field

本文利用自行研制的振动注射实验台 ,实现了熔体在低频振动下的剪切 -压力振动模式。对PS的流变性能进行实验研究发现 :在不同的温度 /压力 /振幅下 ,PS熔体表观粘度随振动频率的增加而下降存在一个敏感区 ,并有使表观粘度最低的最佳振动频率 ;过了敏感区 ,表观粘度随振动频率的增加有较小的回升 ,实验曲线趋于平缓。本实验中 ,PS熔体表观粘度降低多达 6 0 3 %

s By use of self made Vibrating Injection Molding Installation(VIMI),mode of pressure shearing vibration was realized.The rheological behavior of PS melt in the low frequency vibrating field was studied.At different temperature/pressure/amplitude,the results showed that apparent viscosity decreased greatly with the increase of frequency,and there was an optimal frequency to make the apparent viscosity decrease to the lowest point.Then increased the frequency,the apparent viscosity did not decrease but went up tardily.In this experiment the apparent viscosity of PS melt fell 60.3% at the most.