聚乙烯醇缩丁醛/聚乙二醇体系的流变性能  

Rheological Behavior of Polyvinyl Butyral/Polyethylene Glycol System

作　　者：欧阳伟[1] 邱运仁[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《高分子材料科学与工程》2010年第12期92-94,98,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20776161)

摘　　要：采用美国TA公司的AR2000型应力控制流变仪研究了聚乙烯醇缩丁醛/聚乙二醇(PVB/PEG)体系的流变学性能,研究了温度、PVB质量分数与PEG分子量对PVB/PEG体系的流动曲线和非牛顿指数等流变特性的影响。结果表明PVB/PEG体系存在剪切变稀行为,为假塑性流体;温度升高,表观黏度减小,非牛顿指数增大;PVB质量分数增加,表观黏度增加,非牛顿指数减小;PEG分子量增加,表观黏度增加,非牛顿指数变化很小。在一定的浓度和剪切速率下体系的黏度随温度的变化符合Arrhenius方程式,粘流活化能随剪切速率的增加而减小。The rheological behavior of polyvinyl butyral/polyethylene glycol （PVB/PEG） system was studied by AR2000 stress controlled rheometer（TA Co.,USA）. The effects of temperature,mass fraction of PVB,molecular weight of PEG on the rheological curve and non-Newtonian exponent were investigated. The results show that the viscosity of PVB/PEG system decreases with the increase of shear rate,indicating a pseudo-plastic flow characteristic. The apparent viscosity of PVB/PEG system decreases and the non-Newtonian exponent increases with the increase of temperature,the apparent viscosity increases while the non-Newtonian exponent decreases with the increase of PVB mass fraction,the apparent viscosity increases and the non-Newtonian exponent decreases little with the increase of molecular weight of PEG. The relationship of the viscosity and temperature can be described with Arrhenius equation at a certain mass fraction of PVB and shear rate,and the flow activation energy decreases with the increase of shear rates.

关 键 词：聚乙烯醇缩丁醛 非牛顿流体 流变特性 非牛顿指数 粘流活化能 

分 类 号：O631.21[理学—高分子化学]