中文摘要：

聚乙烯醇(PVA)是一种含有大量羟基的水溶性高分子材料,由于其优良的成膜性、水溶性、气体阻隔性、机械性能和生物降解性,已被广泛应用于纤维,薄膜,粘结剂等领域。但PVA的熔融温度和分解温度接近,使得熔融的同时发生分解反应,难于热塑加工。因此对PVA进行改性以提高热塑加工性能成为该材料研究的重要方向之一。常用的改性方法包括化学改性,物理改性和与其它高分子材料复合改性。本文综述了近年来在PVA的热降解行为以及实现PVA热塑加工的改性技术方面的研究进展。

英文摘要：

Poly(vinyl alcohol)(PVA) is one of the most popular water-soluble polymers and has manifested good film forming properties,gas barrier properties,mechanical properties and biodegradability.Therefore,PVA has been widely used as textile,film,adhesive and so on.Because the decomposition temperature of PVA is close to its melting temperature,which makes the thermal degradation undergoes simultaneously during melting,the thermoplastic processing of PVA is difficult to achieve.It is necessary to modify PVA so as ...