研究了不同浓度和分子量的聚乙烯醇(PVA)水溶液的流变性能.讨论了剪切速率和温度对PVA水溶液的表现黏度、非牛顿指数和粘流活化能的影响.实验结果表明,随剪切速率增加,不同浓度和聚合度样品间黏度的差别降低,所有PVA水溶液均显示剪切变稀行为.随PVA浓度提高,溶液的非牛顿指数是先增大后降低.同时发现剪切速率的变化影响PVA水溶液黏度的温度依赖性.
This paper described the rheological properties of a number of aqueous solutions of polyvinyl alcohol (PVA) as a function of the concentration and molecular weight. The effect of shear rate and temperature on the apparent viscosity, non-Newtonian exponent and flow activation energy of the PVA solutions was discussed. The experiment results indicate that the differences in viscosity between PVA solutions decreases, and shear thinning behavior can be observed. The value of n shows an increase with initial increase of concentration and then a decrease with further increase of concentration. It is also worth mentioning that the temperature sensitivity of viscosity for the PVA solutions is affected by the shear rate. With increasing shear rate, the activation energy of the PVA solutions is variational.
参考文献
| [1] | 杨芳,熊宪辉,王琪,李莉.改性聚乙烯醇的流变行为及其吹塑加工研究[J].高分子材料科学与工程,2007(03):190-193. |
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