The active water absorption behavior of poly(styrene-co-methacrylate] PSMANa and sulfonated polystyrene PSSNa ionomers was studied. On one hand, the acidic copolymers did not absorb water noticeably. On the other hand, the amount of water absorbed by the ionomer increased with increasing ion content. Especially when the ion contents of the PSMANa and PSSNa ionomers exceeded 6 and 10 mol%, respectively, the maximum amount of the water absorbed by the ionomers increased rapidly as the ion content increased. This indicated that the cluster-dominant ionomers exhibited stronger water absorption behavior, compared to the matrix-dominant ionomers. In addition, when the ion contents of the PSMANa and PSSNa ionomers were less than 6 and 10 mol%, respectively, the volume and shape of the bulk ionomers did not change significantly by the water absorption. Morphological studies on the soaked ionomers showed that the SAXS peak shifted to lower angles as the water uptake increased with increasing ion content of the ionomers, which was consistent with the results obtained by the swelling method.

研究了聚（苯乙烯-甲基丙烯酸甲酯）PSMANa和磺化聚苯乙烯PSSNa离聚物的活性吸水行为，一方面，酸性共聚物没有明显的吸水能力；另一方面，离聚物的吸水量却增加了尤其是当PSMANa和PSSNa离聚物的离子含量分别超过6和10 mol％时，随着离子含量的增加，离聚物吸收的最大水量迅速增加，这表明簇居主导与基质为主的离聚物相比，离聚物具有更强的吸水性能；另外，当PSMANa和PSSNa离聚物的离子含量分别小于6和10 mol％时，本体离聚物的体积和形状不会改变明显被水吸收。对浸泡的离聚物的形态学研究表明，随着吸水率的增加，随着离聚物的离子含量增加，SAXS峰向较低的角度移动，这与溶胀法获得的结果一致。