Abstract: It is necessary to modify polyvinyl alcohol (PVA) before using it as separation membrane because of its excessive swelling. In this paper，modification methods of PVA are reviewed，including crosslinking，grafting，blending，hybridization and substitution；their advantages and disadvantages are listed；and some comments are given for problems in modification methods. The application of modified PVA membrane is presented in detail. The development and application of PVA pervaporation membrane with excellent hydrophilicity and PVA membrane with high conductivity and low methanol permeability for fuel cell are prospected，respectively.

Key words: poly(vinyl alcohol), membrane, modification, application

摘要： 聚乙烯醇（PVA）的改性处理是其应用于膜分离过程必不可少的环节。本文对PVA膜常用的交联、接枝、共混、杂化和取代等改性方法进行了综述，比较了这几种改性方法的优缺点，针对这些改性方法存在的问题，提出了一些改进思路。论文也详细介绍了PVA改性膜在渗透汽化、超滤、纳滤及燃料电池等方面的应用，最后分别对保持良好亲水性PVA膜在渗透汽化脱水领域和高导电率、低甲醇渗透率PVA膜在燃料电池中的应用前景作了展望。

关键词: 聚乙烯醇, 膜, 改性, 应用