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- W2030268045 endingPage "3131" @default.
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- W2030268045 abstract "Dry and hydrated poly(vinyl alcohol) (PVA) gels with 55% (a-PVA) and 61% (s-PVA) syndiotacticity and related PVA/lactyl chitosan (LC) blends have been investigated with 129Xe and cross-polarization/magic-angle-spinning 13C NMR techniques. Although the dry gels exhibit two broad 129Xe resonances in the slow-to-intermediate exchange limit, both hydrated gels show three resonances. The corresponding dry blends exhibit two signals, the chemical shifts and line widths of which change with respect to those of pure PVA, whereas one (a-PVA/LC) or two (s-PVA/LC) signals appear in the spectra of the hydrated blends. A comparative analysis of the data demonstrates that LC rearranges the domains of the polymeric matrix in both the dry and hydrated blends according to the syndiotacticity of the PVA chains. Information on the molecular motions of the amorphous and swollen polymeric domains in the kilohertz range has been obtained from an analysis of the spin-lattice relaxation times. These data indicate that the dynamics and arrangement of the PVA chains in the gels are strongly affected by their tacticity and the addition of the copolymer LC. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3123–3131, 2003" @default.
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- W2030268045 date "2003-09-02" @default.
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- W2030268045 title "Solid-state13C and129Xe NMR study of poly(vinyl alcohol) and poly(vinyl alcohol)/lactosilated chitosan gels" @default.
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- W2030268045 doi "https://doi.org/10.1002/pola.10899" @default.
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