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Characterization of water in polysaccharide hydrogels by DSC

  • Pharmaceutical & Organic Compounds
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Abstract

Water molecules in hydrogels were classified into three categories according to phase transition behavior; non-freezing, freezing bound and free water. Melting, crystallization, and glass transition of water in hydrogels reflected the state of the water interacting with polysaccharides. Freezing bound water formed metastable ice by slow cooling and formed amorphous ice by quenching. From the isothermal crystallization measurement, nucleation rate and crystal growth rate were obtained. The crystal growth rate of freezing bound water was about ten times slower than that of free water. The DSC characterization of water in hydrogels was summarized.

Zusammenfassung

In Übereinstimmung mit dem Phasenum wandlungsverhalten werden Wassermoleküle in Hydrogelen in drei Kategorien eingestuft; nicht gefrierendes, gefrierendes gebundenes und freies Wasser. Das Schmelzen, die Kristallisation und die Glasumwandlung von Wasser in Hydrogen wiederspiegeln den Zustand von Wasser, welches in Wechselwirkung mit Polysacchariden tritt. Gefrierendes gebundenes Wasser bildet metastabiles Eis durch langsames Abkühlen und amorphes Eis durch Abschrecken. Anhand isothermer Kristallisationsmessungen wurden Keimbildungsgeschwindigkeit und Kristallwachstumsgeschwindigkeit erhalten. Die Kristallwachstumsgeschwindigkeit von gefrierendem gebundenem Wasser liegt zehnmal niedriger als die von freiem Wasser.

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Authors and Affiliations

  1. Department of Industrial Chemistry, Tokyo Metropolitan University, Minami-Ohsawa, 192-03, Hachioji, Tokyo, Japan

    H. Yoshida

  2. Research Institute for Polymers and Textiles, 305, Tsukuba, Japan

    T. Hatakeyama

  3. Industrial Products Research Institute, 305, Tsukuba, Japan

    H. Hatakeyama

Authors
  1. H. Yoshida
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  2. T. Hatakeyama
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  3. H. Hatakeyama
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Yoshida, H., Hatakeyama, T. & Hatakeyama, H. Characterization of water in polysaccharide hydrogels by DSC. Journal of Thermal Analysis 40, 483–489 (1993). https://doi.org/10.1007/BF02546617

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