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Studies on the properties of poly(vinyl alcohol) film plasticized by urea/ethanolamine mixture

机译：尿素/乙醇胺混合物增塑聚乙烯醇薄膜的性能研究

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摘要

This study investigated the effects of urea/ethanolamine mixture (UE) on the crystallinity, thermal, and mechanical properties of poly(vinyl alcohol) (PVA) films. PVA films were prepared from solutions containing PVA, urea, ethanolamine, and water by casting and evaporating at 50°C for 12 h. The plasticization efficiency of UE was compared with that of glycerol (GL), the conventional plasticizer for PVA. The properties of PVA films plasticized by UE and GL, abbreviated to UE-plasticized PVA film and GL-plasticized PVA film, respectively, were investigated by Fourier-transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and mechanical testing. It was proved that UE could form more stable hydrogen bonding with the hydroxyl group of PVA molecule and was more effective in breaking the hydrogen bonds between the hydroxyl groups. Thus, the crystallinity of UE-plasticized PVA films was lower than that of GL-plasticized PVA films. The melting temperatures of UE-plasticized PVA films were lower than those of GL-plasticized PVA films. It was found that UE-plasticized PVA film showed a higher degradation temperature compared with GL-plasticized PVA film. The degree of swelling of UE-plasticized PVA film was higher than that of GL-plasticized PVA film but solubility (S) of UE-plasticized PVA film was lower in aqueous solution. Furthermore, UE-plasticized PVA films show lower tensile strength and higher elongation at break (E) than those of GL-plasticized PVA films. The tensile strength, E, and Young's modulus of PVA film containing 30% UE mixture reached 50.78 MPa, 591.19% and 76.9 MPa, respectively.
机译：这项研究调查了尿素/乙醇胺混合物（UE）对聚乙烯醇（PVA）膜的结晶度，热学和机械性能的影响。通过浇铸并在50°C下蒸发12小时，从包含PVA，尿素，乙醇胺和水的溶液中制备PVA膜。将UE的增塑效率与传统的PVA增塑剂甘油（GL）进行了比较。通过傅立叶变换红外光谱，X射线衍射，差示扫描量热法，热重分析和机械测试。证明UE可以与PVA分子的羟基形成更稳定的氢键，并且更有效地破坏羟基之间的氢键。因此，UE增塑的PVA膜的结晶度低于GL增塑的PVA膜的结晶度。 UE增塑的PVA薄膜的熔融温度低于GL增塑的PVA薄膜的熔融温度。已经发现，与GL增塑的PVA膜相比，UE增塑的PVA膜表现出更高的降解温度。 UE增塑的PVA薄膜的溶胀度高于GL增塑的PVA薄膜，但UE增塑的PVA薄膜在水溶液中的溶解度（S）较低。此外，UE增塑的PVA膜比GL增塑的PVA膜具有更低的拉伸强度和更高的断裂伸长率（E）。含有30％UE混合物的PVA薄膜的拉伸强度，E和杨氏模量分别达到50.78 MPa，591.19％和76.9 MPa。

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