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通过化学修饰，在乙烯－乙烯醇共聚物（ＥＶＡ）分子链上分别引入磺酸基、磷酸基或胺基等，制得具有聚离子性质ＥＶＡ衍生物．由这些聚离子复合而形成的聚离于复合物，即使在含水状态也很少失其强度．动态力学性能的测定表明，除了聚离子之间的静电相互作用外，ＥＶＡ中的乙撑链段及共聚物主链的结晶也对维持聚离子复合物的强度有贡献．在水－二甲基甲酰胺一无机强电解质三组分混合溶剂中，与使用ＮａＢｒ或ＵＢｒ的体系比较，聚离子复合物更易溶解于使用Ｃａ（ＳＯＮ）２、ＺｎＯ２或ＮａＳＣＮ的体系．
Through chemical modification, sulfonic acid groups, phosphoric acid groups and amine groups are respectively introduced into the molecular chain of the ethylene-vinyl alcohol copolymer (EVA) to obtain EVA derivatives with polyionic nature. Polymeric complexes formed by the recombination of these polyions rarely lose their strength even in aqueous conditions. The determination of dynamic mechanical properties shows that in addition to the electrostatic interaction between polyions, the crystallization of the ethylene segments and the backbone of the copolymer in EVA also contributes to the maintenance of the strength of the polyionic composite. Poly (ionic) complexes are more soluble in systems using Ca (SON) 2, ZnO2, or NaSCN in aqueous-dimethylformamide-inorganic strong electrolyte three-component mixed solvents compared to systems using NaBr or UBr.