关键词: 聚乙烯醇, 膜, 改性, 应用

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