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Formation and destruction of physical crosslinks by mild treatments in chemically crosslinked poly(vinyl alcohol) gels

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Abstract

We report the formation, destruction, and re-formation of the microcrystallites in a chemical PVA gel, crosslinked slightly by glutaraldehyde. The dried gel, in which the microcrystallites were formed, was immersed in a poor solvent of a mixture of DMSO and water at 8 °C, where the gel stayed in its collapsed state. The gels swelled on heating to 50 °C, but did not return to the initial state on cooling to 8 °C. After washing the gel completely in water, a drying process caused the microcrystallites to be re-formed and the gel could return to the initial dried state at 8 °C. By using XRD and FT-IR measurements, it was concluded that the formation and destruction of microcrystallites in chemically crosslinked PVA gels could be controlled by the mild treatments of initial drying, temperature change, and washing and drying.

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Acknowledgment

The SAXS experiments were performed under the approval of the Photon Factory Advisory Committee (proposal No. 2008G685).

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Authors and Affiliations

  1. Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Emiko Otsuka & Atsushi Suzuki

  2. Research Reactor Institute, Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan

    Masaaki Sugiyama

Authors
  1. Emiko Otsuka
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  2. Masaaki Sugiyama
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  3. Atsushi Suzuki
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Correspondence to Emiko Otsuka.

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Otsuka, E., Sugiyama, M. & Suzuki, A. Formation and destruction of physical crosslinks by mild treatments in chemically crosslinked poly(vinyl alcohol) gels. Polym. Bull. 67, 1215–1226 (2011). https://doi.org/10.1007/s00289-011-0450-y

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  • DOI: https://doi.org/10.1007/s00289-011-0450-y

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