Summary
This paper is concerned with the solid structure of a new group of transparent glass materials which consist of an organic polymer and a metal oxide, namely a combination of poly(vinylpyrrolidone) and dry silica gel. The structure was analyzed by Atomic Force Microscopy (AFM), BET analysis method, and CP MAS13C-NMR. BET measurement showed that the hybrid material had a quite dense structure which was much less porous than the reference dry silica gel prepared by the conventional sol-gel process. AFM analysis gave the same conclusion, i.e., it showed a granular structure of silica of about 1 nm size. Silica and PVP domains did not show any considerable aggregation. The transparent, homogeneous, and dense structure was attributed to the hydrogen-bond formation between PVP(carbonyl group) and silanol, as demonstrated by CP MAS13C-NMR spectroscopy.
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Toki, M., Chow, T.Y., Ohnaka, T. et al. Structure of poly(vinylpyrrolidone)-silica hybrid. Polymer Bulletin 29, 653–660 (1992). https://doi.org/10.1007/BF01041151
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DOI: https://doi.org/10.1007/BF01041151