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- W1686364098 abstract "This chapter discusses the structure and hydrogen bonding of poly (vinyl alcohol) (PVA) as analyzed by cross polarization and magic angle spinning (CP/MAS) 13 C nuclear magnetic resonance (NMR) spectroscopy. The chapter describes the CP/MAS 13 C NMR spectra of unannealed PVA films prepared from aqueous, dimethyl sulphoxide (DMSO) and hexafluoroisopropanol (HFIP) solutions. The relative intensities of the CH triplet of the sample prepared from the aqueous solution are significantly different from those for the samples prepared from DMSO and HFIP solutions. The precise analytical method of both hydrogen bonding and conformations of PVA in the noncrystalline and frozen solution states are being developed by considering the upfield shifts of the CH resonance line because of the formation of the intramolecular hydrogen bonds and the downfield shifts induced by the γ-gauche effect. After the establishment of this method, high resolution solid-state 13 C NMR spectroscopy should become more powerful in characterizing detailed local structure of PVA in different states. Further experimental results obtained by this method can contribute to the development of high-performance PVA materials." @default.
- W1686364098 created "2016-06-24" @default.
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- W1686364098 date "1998-01-01" @default.
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- W1686364098 title "Hydrogen-Bonded Polymers" @default.
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- W1686364098 doi "https://doi.org/10.1016/s0167-6881(98)80027-x" @default.
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