Polymer structure-dependent ion interaction studied by amphiphilic nonionic poly(organophosphazenes)

被引:6
作者
Ahn, Sungsook [1 ]
Ahn, Sung Won [1 ]
Song, Soo-Chang [1 ]
机构
[1] Life Sciences Research Division, Korea Institute of Science and Technology (KIST), Wolsong-gil 5, Seongbuk-gu, Seoul 136-791
关键词
Interfacial interaction; Ion; Phase transition; Polyphosphazene; Thermothickening;
D O I
10.1002/polb.21537
中图分类号
学科分类号
摘要
The relative effectiveness of anions and cations in altering macromolecular conformation was reported to be independent of the nature of the macromolecule. However, in terms of the degree of changes, macromolecule-dependent ion action cannot be underestimated. The designed poly(organophosphazenes) have been selected for this study due to its versatility of the substitution with a fixed backbone. To set up the systematic explanation on the ion action related with molecular interactions, ions and polymers are arranged based on the water binding ability. As a characteristic factor specific in the thermothickening system, the temperature at which the viscosity of the polymer solution reaches the maximum (Tmax) has been compared. Anions with strong water binding ability more effectively lower the Tmax of the hydrophobic poly(organophosphazenes). Meanwhile, the Tmax of the cation-complexed poly(organophosphazenes) are lowered by the sequence of water binding ability of the complexed cations. In both the anion and cation interactions, poly(organophosphazenes) substituted by longer PEG and more hydrophilic amino acid ester, show differentiated result due to different interaction with water when compared with other polymer systems in this study. Ion interaction with poly(organophosphazenes) mediated by water supports interfacial interactions expressed by interaction parameters, which strongly depends on the polymer structure and ion type. © 2008 Wiley Periodicals, Inc.
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页码:2022 / 2034
页数:12
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