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Preparation and characterization of chitosan/polyvinyl alcohol blends-a rheological study

机译:壳聚糖/聚乙烯醇共混物的制备与表征-流变学研究

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摘要

Blends of chitosan (CS) and polyvinyl alcohol (PVA) of different proportions (considering chitosan as the main component) were prepared. The rheological properties of the obtained blend solutions such as the shearing viscosity and the shear stress were investigated as a function of shear rate under various temperatures, shearing times and solution storage times using a digital viscometer. The CS/PVA solutions showed a Newtonian behavior at temperatures in the range of 40-55 °C regardless of the blend composition. This was accompanied by a general decrease in the viscosity with increasing PVA content in the blend. The heat-dependant viscosity changes of the blend solutions were found to follow Arrhenius equation. The shearing time was found to have no significant effect on the shearing viscosity of all blended solutions. However, the variation of solution storage period was found to have a mixed effect when time was extended to 3 weeks.
机译:制备了不同比例的壳聚糖(CS)和聚乙烯醇(PVA)(以壳聚糖为主要成分)的共混物。使用数字粘度计,研究了在不同温度,剪切时间和溶液储存时间下,所得剪切混合物的流变性质,如剪切粘度和剪切应力与剪切速率的关系。无论共混物的组成如何,CS / PVA溶液在40-55°C的温度下均表现出牛顿特性。随着共混物中PVA含量的增加,粘度普遍降低。发现共混溶液的热依赖性粘度变化遵循Arrhenius方程。发现剪切时间对所有混合溶液的剪切粘度没有显着影响。然而,当时间延长至3周时,发现溶液储存时间的变化具有混合作用。

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