中文摘要：

聚乙烯醇（PVA）薄膜存在易吸水发生溶胀而出现气体阻隔性和力学性能下降的缺点，不适合用于气体阻隔性和力学性能要求高的场合，因此需要改善它的耐水性。本文首先介绍了评价PVA薄膜耐水性的4种方法和PVA树脂的醇解度与分子量对薄膜耐水性的影响，然后重点述评了改善PVA薄膜耐水性的4种方法，即化学交联法、物理交联法、无机纳米材料复合法和聚合物共混法的机理和研究进展，比较了它们的优缺点。论文还介绍了耐水性PVA薄膜在水的分离纯化、包装、偏振片和生物医学等领域的应用，最后对其未来发展方向做了展望，其中研究新的绿色环保的改性方法，进一步提高PVA薄膜的耐水性，拓展其应用范围是今后值得关注的研究课题。

英文摘要：

Poly(vinyl alcohol)(PVA)film has the disadvantage of absorbing water easily to swellwhich then weakens its gas barrier and mechanical properties,so it is not suitable for the applicationsrequiring high gas barrier property and mechanical properties and its water-resistance needs to beimproved.In this article,four methods for evaluating the water resistance of PVA film and theinfluence of alcoholysis degree and molecular weight of PVA resin on its water resistance areintroduced firstly.Then,the mechanisms and research progress of four approaches for improving PVAfilm’s water resistance(chemical crosslinking,physical crosslinking,inorganic nanomaterial compositeand polymer blending methods)are reviewed intensively,and their advantages and drawbacks arecompared.The applications of water resistant PVA film in separation and purification,package,polaroid and biomedicine are introduced.Finally,the outlook of water resistant PVA film is given.Thedevelopment of novel green and environment-friendly method to improve its water resistance furtherand the extension of its application range are the research subjects deserving more attention.