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首页> 外文期刊>RSC Advances >Folding and birefringence behavior of poly(vinyl alcohol) hydrogel film induced by freezing and thawing
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Folding and birefringence behavior of poly(vinyl alcohol) hydrogel film induced by freezing and thawing

机译：聚乙烯醇水凝胶薄膜冻融引起的折叠和双折射行为

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摘要

Band-like folds with high aspect ratio and birefringence behavior were observed on an in situ formed thin poly(vinyl alcohol) (PVA) hydrogel film via freezing-thawing treatment of PVA aqueous solution coated on glass. The crystallites generated during the freezing of the PVA solution cross-linked the PVA to form the hydrogel film. The volume expansion of the hydrogel film due to the absorption of condensed water in thawing induced the formation of folds. These folds show interesting birefringence behavior. The morphology, crystallization and birefringence behavior of the folds were characterized by polarized optical microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. A plausible principle for the fold formation is also discussed. It has been found that the moderate interaction between the hydrogel film and the substrate and the existence of condensed water on the frozen hydrogel film play important roles in the appearance of the folds.
机译：通过对玻璃上涂覆的PVA水溶液进行冻融处理，在原位形成的聚乙烯醇（PVA）水凝胶薄膜上观察到了具有高长宽比和双折射行为的带状褶皱。在PVA溶液冷冻期间产生的微晶交联PVA以形成水凝胶膜。由于在解冻过程中吸收了冷凝水，水凝胶膜的体积膨胀引起褶皱的形成。这些褶皱显示出有趣的双折射行为。通过偏振光学显微镜，扫描电子显微镜，傅立叶变换红外光谱和X射线衍射表征了褶皱的形态，结晶和双折射行为。还讨论了折叠形成的合理原理。已经发现水凝胶膜与基底之间的适度相互作用以及在冷冻水凝胶膜上冷凝水的存在在褶皱的外观中起重要作用。

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