Calorimetric investigation of some polysaccharides subjected to high-pressure plastic deformation

Differential scanning calorimetry is used to establish that, at 20–200°C, an endothermic process proceeds in polysaccharides (cellulose, methyl cellulose, cellulose di- and triacetate, chitin, chitosan, starch, etc.) whose enthalpy is noticeably enhanced after plastic deformation of the polymers at...

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Published inPolymer Science. Series A Vol. 52; no. 4; pp. 398 - 406
Main Authors Zhorin, V. A., Kiselev, M. R., Zelenetskii, A. N., Rudakova, T. A.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.04.2010
Springer Nature B.V
Subjects
Cellulose
Chemistry
Chemistry and Materials Science
Differential scanning calorimetry
Endothermic reactions
Enthalpy
Plastic deformation
Polymer Sciences
Polysaccharides
Starches
Structure and Properties
Transformations
Endothermic Peak
Chitin
Chitosan
Plastic Deformation
Enthalpy
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Summary:Differential scanning calorimetry is used to establish that, at 20–200°C, an endothermic process proceeds in polysaccharides (cellulose, methyl cellulose, cellulose di- and triacetate, chitin, chitosan, starch, etc.) whose enthalpy is noticeably enhanced after plastic deformation of the polymers at 0.5–2.0 GPa. By the example of cellulose, it is shown that the process is associated with water present in the polymers. An increase in the enthalpy as a result of pressure treatment is due to both structural transformation of cellulose I into cellulose II and the intensification of intermolecular interactions in the polymers that is due to formation of a system of electric charges in the samples.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0965-545X
1555-6107
DOI:10.1134/S0965545X10040085