温度对PVB/Pluronic F127/PEG200体系的动态流变学行为的影响  

Effect of Temperature on Dynamic Rheological Behavior of Poly (Vinyl Butyric)/Pluronic F127/Polyethylene Glycol 200 System

作　　者：邱运仁[1] 欧阳伟[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8期19-22,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20776161)

摘　　要：采用动态流变仪研究了温度对聚乙烯醇缩丁醛(PVB)/Pluronic F127/聚乙二醇(PEG)200共混体系的动态流变学性能的影响。结果表明,体系的黏度随剪切频率的增大而减小,表现出假塑性流体的特征;复数黏度、动态储能模量、动态损耗模量随温度的升高而降低;非牛顿系数和损耗因子随温度的升高而增大。体系在温度高于140℃时表现出均相聚合物体系的流变行为,低于140℃时动态储能模量明显偏离了均相体系低频末端的标度规则。The effect of temperature on dynamic rheological properties of poly （vinyl butyric） （PVB）/Pluronie F127/polyethylene glycol （PEG） 200 system was investigated by dynamic rheometer. The results show that the viscosity of PVB/F127/PEG200 system decreases with the increase of shearing frequency, indicating a pseudo-plastic flow characteristic. The complex viscosity, dynamic storage modulus and dynamic loss modulus decrease with the increase of temperature; the non-Newtonian and loss factor increase with the increase of temperature. The system behaves as a homogeneous polymer solution when the temperature is greater than 140 ℃, the dynamic storage modulus of the system significantly deviates from classical terminal behavior below 140 ℃

关 键 词：聚乙烯醇缩丁醛 嵌段共聚物 聚乙二醇 动态流变性能 

分 类 号：O631.21[理学—高分子化学]