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首页> 外文期刊>Journal of Applied Polymer Science >Characterization of the water state of hyaluronic acid and poly(vinyl alcohol) interpenetrating polymer networks
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Characterization of the water state of hyaluronic acid and poly(vinyl alcohol) interpenetrating polymer networks

机译：透明质酸和聚乙烯醇互穿聚合物网络的水状态表征

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摘要

Interpenetrating polymer networks (IPNs) composed of hyaluronic acid and poly(vinyl alcohol) hydrogels were prepared, and the influence of water and the drying kinetics were investigated. The IPN hydrogels were characterized with thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The glass-transition temperatures of the IPN hydrogels decreased with increasing water content. The bound water was the sum of the nonfreezing bound water and freezing bound water. From the DSC melting curves, the values of the total water and freezing bound water were evaluated for IPN hydrogels containing large amounts of water. At the same time, the bound water value was estimated with TGA. In the TGA curves, one-step and two-step weight losses, corresponding to free water and nonfreezing bound water, were observed. The bound water of the hydrophilic polymers broke the hydrogen bonding between the hydroxyl groups of the polymers. The swollen IPN hydrogels exhibited relatively high bound water contents (43.04-59.17%) by DSC and TGA. The bound water contents of the dry IPN hydrogel films were 10.2-15.29% by TGA. The drying reaction rate constant of the IPN hydrogel increased with increasing temperature. (C) 2004 Wiley Periodicals, Inc. [References: 26]
机译：制备了由透明质酸和聚乙烯醇水凝胶组成的互穿聚合物网络（IPNs），并研究了水的影响和干燥动力学。 IPN水凝胶通过热重分析（TGA）和差示扫描量热法（DSC）进行表征。 IPN水凝胶的玻璃化转变温度随着水含量的增加而降低。结合水是非冷冻结合水和冷冻结合水的总和。从DSC熔融曲线，评估了包含大量水的IPN水凝胶的总水和冻结结合水的值。同时，用TGA估算结合水值。在TGA曲线中，观察到与游离水和非冻结结合水相对应的一级和二级失重。亲水性聚合物的结合水破坏了聚合物羟基之间的氢键。通过DSC和TGA，溶胀的IPN水凝胶显示出较高的结合水含量（43.04-59.17％）。通过TGA，干燥的IPN水凝胶膜的结合水含量为10.2-15.29％。 IPN水凝胶的干燥反应速率常数随温度升高而增加。 （C）2004 Wiley Periodicals，Inc. [参考：26]

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