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A DSC Study of the Endothermic Process, Associated with Hydrogen Bonding, in Polysaccharides after High-Pressure Plastic Deformation

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Abstract

Microcrystalline cellulose, starch, methyl cellulose, chitin, and polyacrylamide have been studied by differential scanning calorimetry and thermogravimetry. The thermograms of these polymers in the temperature range of 20–200°С display endothermic peaks describing the process of destruction of hydrogen bonds. The endothermic process is accompanied by mass loss associated with desorption of water from the samples. Adsorbed water plays a major role in the formation of hydrogen bonds in the polymers. The polymers and their mixtures were subjected to plastic deformation under a pressure of 2 GPa in an anvil type high-pressure device. As a result of this treatment, the enthalpies of endothermic processes in individual polymers increased by a factor of 2.8, but decreased in the polymer blends. In the deformed blends of microcrystalline cellulose with polyacrylamide, up to 36% of cellulose became water-soluble. According to its effect on cellulose, polyacrylamide can be compared with malonic acid.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119991, Moscow, Russia

    V. A. Zhorin

  2. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    M. R. Kiselev

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  1. V. A. Zhorin
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  2. M. R. Kiselev
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Correspondence to V. A. Zhorin or M. R. Kiselev.

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Translated by S. Zatonsky

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Zhorin, V.A., Kiselev, M.R. A DSC Study of the Endothermic Process, Associated with Hydrogen Bonding, in Polysaccharides after High-Pressure Plastic Deformation. High Energy Chem 54, 263–269 (2020). https://doi.org/10.1134/S0018143920040141

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  • DOI: https://doi.org/10.1134/S0018143920040141

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