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- W2000833164 abstract "The so-called “super-salt-resistive gel”, or poly(4-vinylphenol) (P4VPh) hydrogel, of different water contents (H = 97−51%) was prepared by cross-linking with different amounts of ethylene glycol diglycidyl ether. 1H NMR spectroscopy was used to investigate the dynamic properties of water in the gel samples in terms of the spin−spin relaxation. The T2 values in those hydrogels were analyzed by assuming a two-component system, namely, T2(long) and T2(short), and their fractions were obtained. In the higher water content region (75% ≤ H ≤ 97%), T2(long) for P4VPh gel was almost constant or even slightly increased with decreasing temperature. On the other hand, T2(long) for poly(vinyl alcohol) (PVA) gel (80% ≤ H ≤ 96%) significantly decreased with decreasing temperature, showing a natural behavior for water mobility in common hydrogels. Water in P4VPh gels of lower water contents (H = 70% and 51%) also showed intriguing behaviors: the T2 values are much larger than those of gels with higher water contents and decreased with decreasing temperature only in the lower temperature range (<10 °C). The fraction of T2(long) values of P4VPh gel showed another contrast to those of PVA gel; the latter decreased with deceasing water content (normal behavior), while in the former gel the highest fraction (ca. 60% at 20 °C) was observed for a sample with the lowest water content (H = 51%). On the other hand, the results of DSC measurements for P4VPh gel were less specific than those of T2 and comparable to those of common hydrogels such as PVA; with decreasing water content, the total amounts of free water and freezable bound water per polymer mass (g/g) decreased, while the amount of nonfreezing water per polymer also decreased." @default.
- W2000833164 created "2016-06-24" @default.
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- W2000833164 date "2008-06-07" @default.
- W2000833164 modified "2023-09-23" @default.
- W2000833164 title "Water Properties in the Super-Salt-Resistive Gel Probed by NMR and DSC" @default.
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- W2000833164 doi "https://doi.org/10.1021/la800397f" @default.
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