中文摘要：

通过静电纺丝技术制备了聚乙烯醇（PVA）纳米纤维膜，研究了热压处理的条件（温度、压力、时间）对提升PVA纤维膜水稳定性的影响。随着热压温度的增加，PVA纤维膜的水稳定性增强，红外测试显示，不同温度（50℃、100℃、155℃）热压处理，水稳定性增强的机理不同。扫描电镜照片及水稳定性测试表明，与单纯加热处理相比，热压处理可在较低温度下达到较高温度的效果，压力起到了协同作用。热压压力大于4MPa后，纤维膜的水稳定性无明显提升，热压时间对不同温度处理的PVA纤维膜的水稳定性影响有明显差异。综合考虑PVA的性能和水稳定性，最佳热压处理条件为100℃，4MPa，2min。

英文摘要：

Polyvinyl alcohol （PVA） nanofiber membranes were prepared by electrospinning technique. Influence of conditions （temperature, pressure, time） on the water stability of PVA fiber membrane after hot pressing were studied. With temperature increased, the water stability of PVA fiber membranes was raised. ATR-IR showed improvement of water stability act through different mechanisms during hot press processing at different temperatures （50℃, 100℃, 155℃）. Scanning electron microscopy and water stability tests showed that hot pressing treatment at lower temperature had reached the same results as obtained by the pure heat treatment at higher temperature because of synergistic effect of pressure. When the pressure was larger than 4MPa, the water stability of the fiber membrane appeared no obvious promotion. There was a clear difference about the effect of hot pressing time on the stability of PVA fiber membrane in water treated at different temperatures. Combined performances with water stability of PVA, the best conditions of hot pressing processing were 100℃, 4MPa and 2min.