采用溶液成膜的方法制备了不同Mg(NO3)2含量的聚乙烯醇(PVA)/Mg(NO3)2复合薄膜.考察了PVA/Mg(NO3)2复合薄膜在相对湿度为54%时的含水量.采用X射线衍射(XRD),差示扫描量热(DSC),动态力学性能(DMA)和力学性能测试方法研究了Mg(NO3)2对PVA膜的结构和性能的影响.结果表明,Mg(NO3)2与PVA的相容性非常好,所制备的PVA/Mg(NO3)2复合膜的透明性好.Mg(NO3)2的加入能显著破坏PVA中的氢键作用,增加PVA膜中的水含量,降低FVA的结晶度,使复合膜的玻璃化温度明显降低.拉伸实验表明,PVA/Mg(NO3)2具有比纯PVA膜更低的拉伸强度和更高的断裂伸长率.
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