Water sorption on and water diffusion in chitin and chitosan |
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| Authors: | A E Chalykh T F Petrova R R Khasbiullin A N Ozerin |
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| Institution: | 1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Science, Leninskii pr. 31, Moscow, 119071, Russia
2. Enikolopov Institute of Synthetic Polymer Materials, Russian Academy of Science, ul. Profsoyuznaya 70, Moscow, 117393, Russia
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| Abstract: | The kinetics of the sorption of water vapor on powders of crab-shell chitin and chitosan are studied via the methods of static sorption, thermography, and X-ray structural analysis. Sorption isotherms are obtained in the range of humidity from 10 to 95%. S-Shaped water-sorption isotherms observed for all chitin and chitosan samples are approximated via superpositioning of Langmuir and Flory-Huggins isotherms. The water-polysaccharide interaction parameters and the maximum sorption capacities of water located in chitin and chitosan are determined. The cluster integral is calculated, and the moisture values corresponding to water-cluster formation are determined. The water-diffusion coefficients are determined, and the effective activation energies of water diffusion are estimated: 70 kJ/mol in chitosan and 60 kJ/mol in chitin. The data on the concentration dependences of the coefficients of diffusion of water in the powdered chitin and chitosan are summarized. |
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