PVDF熔体的流变特性研究  

Study on Rheological Properties of Polyvinylidene Fluoride Melt

作　　者：肖炳荣 邓远程 艾建军 XIAO Bingrong;DENG Yuancheng;AI Jianjun(Hunan Provincial Engineering Research Center for Special Engineering Plastics,Zhuzhou 412007,China;Zhuzhou Hongda Polymer Material Co.,Ltd.,Zhuzhou 412007,China)

机构地区：[1]湖南省特种工程塑料工程技术研究中心,湖南株洲412007 [2]株洲宏大高分子材料有限公司,湖南株洲412007

出　　处：《有机氟工业》2023年第4期4-6,25,共4页Organo-Fluorine Industry

摘　　要：为克服宽幅PVDF挤出板材的工艺难点,采用Rosand RH7毛细管流变仪研究了PVDF熔体在不同温度和不同剪切速率(0.5~200.0 s-1)下的流变行为。结果表明:在较低的剪切速率(0.5~20.0 s-1)时,PVDF熔体黏度随剪切速率的变化而变化较大,而在较高的剪切速率(20~200 s-1)时,PVDF熔体黏度随剪切速率的增加变化不明显。其流动行为符合幂律模型,但非牛顿指数n随着温度的升高而增大,随着剪切速率的增大而下降。同时探讨了剪切速率、温度对PVDF熔体黏流活化能的影响。To overcome the difficulty in manufacture of broad width panel,rheological behavior at a range of shear rates(0.5~200.0 s~(-1))for polyvinylidene fluoride melt is investigated at a range of temperature by means of Rosand RH7 rheometer.The results show that the melt viscosity of PVDF declines rapidly with increasing shear rates at lower shear rates(0.5~20.0 s~(-1)),the melt viscosity of PVDF declines slowly with increasing shear rates at higher shear rates(20~200 s~(-1)).Its flower behavior confirms to the power-law model,but the non-Newtonian exponent increases with increasing temperature and decreases with increasing shear rate.Furtherly,such as effectivity of temperature and shear rates on flow activation energy of PVDF melt are discussed.

关 键 词：聚偏氟乙烯 流变特性 非牛顿指数 熔体黏度 黏流活化能 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]