Abstract:

Polyvinyl alcohol (PVA) has become one of the most widely used hydrophilic membrane materials because of its good chemical stability, acid resistance, alkali resistance and organic solvent resistance, as well as excellent film-forming property and biological safety. However, the weak mechanical properties and poor water resistance of hydrophilic PVA membrane seriously limit its practical applications. In recent years, a lot of studies have been carried out to promote the properties of PVA membrane by blending, nanocomposite, heat treatment, chemical crosslinking and synergistic modifications, which have achieved great success. In this paper, the characteristics and existing problems of different PVA membrane modification methods were summarized, and the research status of excellent fillers in improving the mechanical properties of PVA membrane by nano-composite was emphasized. Also, the effects of blending, heat treatment and chemical crosslinking for the modification of PVA membrane were briefly introduced, and the significance of synergistic modification to improve the comprehensive properties of PVA membrane was stressed. This paper would provide a novel perspective for the design and preparation of high-performance PVA membrane. The modified PVA membrane had a good application prospect in the fields of water treatment and food packaging.

Key words: polyvinyl alcohol (PVA) membrane, modification, nanocomposite, mechanical strength, water resistance

摘要：

聚乙烯醇（PVA）因其良好的化学稳定性、耐酸碱、耐有机溶剂性以及优异的成膜性和生物安全性，成为应用最广泛的亲水性膜材料之一。但亲水性PVA膜力学性能弱和耐水性能差等缺点严重限制其实际应用。近些年，人们通过共混、纳米复合、热处理、化学交联以及协同改性等方法对PVA膜进行了大量的改性研究工作并取得了众多成果。本文总结了不同PVA膜改性方法的特点及存在的问题，重点阐述了性能优异的填料在纳米复合改进PVA膜力学性能上的研究现状，简述了共混、热处理、化学交联对改性PVA膜的作用，强调了协同改性对提高PVA膜综合性能的重要意义，为设计和制备高性能的PVA膜提供一定的参考。指出改性后的PVA膜在水处理和食品包装领域具有良好的应用前景。

关键词: 聚乙烯醇膜, 改性, 纳米复合, 力学强度, 耐水性