摘要
利用毛细管流变仪和反向压力腔组件在毛细管出口压力高于常压条件下,对聚对苯二甲酸乙二醇酯(PET)熔体的剪切黏度进行研究,得到了PET剪切黏度分别与毛细管平均压力和剪切速率的依赖关系。结果表明:在恒剪切速率下,PET剪切黏度随着毛细管平均压力的升高而增大,但各剪切速率下增大程度存在差异,在低剪切速率下剪切黏度受压力影响更显著;在恒毛细管平均压力下,PET剪切黏度随剪切速率的增大而减小,表现为剪切变稀现象;通过计算得到290℃时PET的恒剪切速率的压力系数约为11.94 GPa-1。
The variation of the shear viscosity of poly（ethylene terephthalate）（PET） melt was investigated using the capillary rheometer and counter pressure chamber when the pressure at the outlet of capillary was higher than normal pressure,and it was observed that the shear viscosity of PET was dependent on the average capillary pressure and shear rate,respectively.The results show that when shear rate is fixed constant,the shear viscosity of PET increases with the increase of average capillary pressure,but the increase margin varies with shear rate.The effect of pressure is more prominent at low shear rate.When the average capillary is fixed constant,the shear viscosity of PET decreases with the increase of shear rate,as it is shown by less shearing.It was found by computation that the pressure coefficient of PET at 290 ℃ was about 11.94 GPa-1 when shear rate is fixed constant.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2012年第3期1-4,共4页
Journal of Textile Research
基金
国家科技支撑计划项目(2009BAE75B00)
关键词
PET
剪切黏度
压力
剪切速率
压力系数
PET
shear viscosity
pressure
shear rate
pressure coefficient
