高分子量聚丙烯酸改性聚乙烯醇膜的耐水性能

将高分子量聚丙烯酸（PAA）与聚乙烯醇（PVA）混合，制备成PAA/PVA混合膜并对其进行热处理。考察了PAA分子量及其含量对混合膜耐水性能的影响，研究了热处理工艺条件对混合膜在沸水环境下的保留率。结果表明，随着PAA分子量和在混合膜中含量的增加，混合膜的耐沸水性能显著提高；当PAA加入量为30%（质量分数），热处理温度和时间分别为160～180℃、3～5min时，混合膜的综合性能最佳；热处理后混合膜的玻璃化转变温度T_g提高到102℃，有效扩大了膜的使用温度范围。

Water-resistance of polyvinyl alcohol films modified by high molecular weight polyacrylic acid

Blend films have been prepared from a mixture of high molecular weight polyacrylic acid (PAA) and polyvinyl alcohol (PVA). The PAA/PVA blend films were crosslinked through heat treatment. The effects of varying the molecular weight and content of PAA on the water resistance of the resulting films were investigated, and the retention ratio of the PAA/PVA blend films was studied in boiling water. The results showed that the boiling water resistance increased as the molecular weight and the content of PAA were increased. The optimum heat treatment temperature was found to be in the range 160-180℃， and the optimum heating time in the range 3-15min. The maximum observed T_g value of the blend films after heat treatment was 102℃, which represents an expansion of the temperature range in which blend films can be used.