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À propos de : Dielectric Properties of Collapsing Hydrogels        

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  • Dielectric Properties of Collapsing Hydrogels
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  • Dielectric spectra were measured for the polymer gel of N-isopropylacrylamide (NIPA) andcopolymer gels of N-isopropylacrylamide and sodium styrenesulfonate (NIPA−SS) in the swollen andcollapsing states in the frequency range from 100 kHz to 2 MHz. Dispersions were observed for the NIPAgel in the collapsing state and NIPA−SS gels in both the collapsing and swollen states. The characteristicsof dispersions in the collapsing gels were different from the characteristics in the swollen gels, while theformer characteristics are very similar in NIPA and NIPA−SS. The similarity between dispersionsobserved for NIPA and NIPA−SS gels indicates that counterions of NIAP−SS gels bind tightly to theionized groups and cannot move freely in the collapsing gels. The analysis of the dispersions reveals thatwater molecules inside the collapsing gels are surrounded by the gel chains and form electricallydisconnected clusters.
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