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- W2057100777 abstract "The understanding of mechanisms involved in the controlled release of active molecules from the polymer matrix requires the study of hydration phenomenon. Fluorescence and attenuated total reflection Fourier transform infrared (ATR−FTIR) spectroscopies were used to analyze the earlier steps of hydration in acrylic copolymers. The effect of hydration on the anisotropy of the PRODAN fluorescent probe showed a change in the dynamics of the macromolecular chains. By using ATR−FTIR spectroscopy, the structure of dissolved water in polymers was studied. The evolution of this structure was performed as hydration proceeds by band decomposition of the νOH vibration on the basis of the four-state model which allows discriminating bound from free molecules: in the “early” stages of hydration, the water network appears drastically perturbed as compared to that of bulk pure water, this perturbation vanishing in the “later” stages of hydration. Besides, this study reveals that the polymer carbonyl groups constitutes the major water binding sites as it was deduced from their progressive engagement in H bonds in the time course of hydration. The rate and extent of this process was observed to be correlated with the hydrophobicity of polymers. The present findings, obtained on similar time scales from noninvasive techniques, indicate that both dynamic and structural consequences of hydration are correlated in most of the polymers here studied." @default.
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- W2057100777 date "2001-12-18" @default.
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- W2057100777 title "Structural and Dynamic Approach of Early Hydration Steps in Erodable Polymers by ATR−FTIR and Fluorescence Spectroscopies" @default.
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- W2057100777 doi "https://doi.org/10.1021/ma010501k" @default.
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