Changes in Crystallization Behaviors of Poly(Vinyl Alcohol) Induced by Water Content,Journal of Vinyl and Additive Technology

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Changes in Crystallization Behaviors of Poly(Vinyl Alcohol) Induced by Water Content
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2020-05-23 , DOI: 10.1002/vnl.21775
Aimin Xiang ₁ , Chang Lv ₁ , Hongfu Zhou ₁

Affiliation

Water as the low‐cost, environmentally friendly, easily obtained plasticizer was used widely in the preparation of poly(vinyl alcohol) (PVA) products. However, few researches were done to investigate the effect of water content on the crystallization behaviors of PVA. The water content in various PVA films was controlled by drying in a vacuum oven at different time and was determined by thermogravimetric analysis. The changes in crystallization behaviors of PVA affected by water content were investigated using differential scanning calorimeter, Fourier transform infrared spectra, and X‐ray diffraction. The wafer thickness and nonisothermal crystallization kinetics of various PVA films were also studied. The corresponding results showed that the crystallinity of various PVA films increased and then stabilized as the drying time increased. The distribution of wafer thickness in PVA films became narrow, and their wafer thickness value became small. The decrease of water content in PVA films promoted the crystallization rate, because the movement ability of PVA molecular chains was enhanced by the decrement in hydration hydrogen bonds in various PVA films.

中文翻译：

水分诱导的聚乙烯醇结晶行为的变化

作为低成本，环保，易得的增塑剂，水被广泛用于制备聚乙烯醇（PVA）产品。然而，很少有研究来研究含水量对PVA结晶行为的影响。通过在不同时间在真空烘箱中干燥来控制各种PVA膜中的水含量，并通过热重分析来确定。使用差示扫描量热仪，傅立叶变换红外光谱和X射线衍射研究了受水含量影响的PVA结晶行为的变化。还研究了各种PVA薄膜的晶片厚度和非等温结晶动力学。相应的结果表明，随着干燥时间的增加，各种PVA薄膜的结晶度增加，然后稳定下来。PVA膜中晶片厚度的分布变窄，并且晶片厚度值变小。PVA膜中水含量的减少促进了结晶速率，因为各种PVA膜中水合氢键的减少增强了PVA分子链的运动能力。

更新日期：2020-05-23

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