聚乙烯醇衍生的聚离子复合物的研究　Ⅲ．乙烯－乙烯醇共聚物的化学修饰及其复合物

POLYIONIC COMPLEX DERIVED FROM POLYVINYL ALCOHOL Ⅲ. MODIFICATION OF ETHYLENE-VINYL ALCOHOL COPOLYMER AND FORMATION OF THE CORRESPONDING COMPLEXES

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．

Polycations and polyanions of polyvinyl alcohol with various degree of substitution were prepared by acetalization of polyvinyl alcohol with aldehyde compounds and then, neutralized or quaternized with methyl iodide. The corresponding polyion complexes were obtained by mi-xing the aqueous solutions of these polycations and polyanions. The solvation behaviour of these polyion complexes were investigated.