SPS及其离聚体的形态结构与热性能

MORPHOLOGY AND THERMAL PROPERTY OF SULFONATED POLYSTYRENE AND ITS IONOMERS

通过ＤＳＣ、ＤＭＡ、ＴＥＭ、ＳＡＸＳ和ＴＧ对ＳＰＳ（磺化聚苯乙烯）及其离聚体的形态结构和热性能进行了研究。结果表明，在磺酸基含量为９．８３ｍｏｌ％的ＳＰＳ中有磺酸离子的聚集。金属离子的引入使ＳＰＳ离聚体的分子间作用力、微相分离程度增大。磺酸盐含量为４．７０ｍｏｌ％以上的ＳＰＳ离聚体中有离子聚集，离子簇直径为３～１０ｎｍ。在磺酸盐含量为１３ｍｏｌ％范围内，ＳＰＳＮａ离聚体基体的Ｔｇ１、离子微区的Ｔｇ２均随磺酸盐含量的增加而线性增大。ＰＳ磺化、中和成ＳＰＳ离聚体后，热稳定性增加，其顺序为：ＳＰＳＺｎ＞ＳＰＳＮａ＞ＳＰＳ＞ＰＳ。

he morphology and thermal property of sulfonated polystyrene (SPS) and its ionomers were studied through DSC, DMA, TEM, SAXS and TGA. The results show that there is sulfonic acid ionic aggregation in the SPS containing 9.83 mol% content of SO3H group. The introduction of metal counterion enhances the interaction force between sulfonic salts and the degree of microphase seperation in SPS ionomer.It is found to exist the sulfonate ion aggregation in the SPS ionomer of more than 4 mol% sulfonate content. The diameter of cluster is in the range of 3￣10 nm. Tg1 of matrix and Tg2 of ionic domain of SPS ionomer increase linearly with the increase of sulfonate content in the range of 13 mol%. The thermal stabilities of SPS and its ionomers are higher than that of polystyrene, the thermal stability decreases in following order: SPSZn>SPSNa>SPS>PS.