Influence of organic solvents and acids on hydration properties of chitosan

1Filatova, KO, 1Krupska, TV, 1Turov, VV
1O. O. Chuiko Institute of Surface Chemistry of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2017, 5:80-88
https://doi.org/10.15407/dopovidi2017.05.080
Section: Chemistry
Language: Russian
Abstract: 

The states of water and an aqueous solution of trifluoroacetic acid in a swollen chitosan and chitosan filled with nanosilica A-300 by low-temperature 1H NMR spectroscopy are studied. It is shown that the main part of water in the polymer matrix is included in the domains with R > 10 nm. Introduction of nanosilica into the polymer matrix reduces the binding energy by almost 30 % through the formation of bonds between chitosan and silica (water displacement in the gaps between the biopolymer and SiO2). In the presence of a strong acid (TFA), polyassociations of water with varying solubility relative to acids within the polymeric matrix of pure chitosan and chitosan filled with SiO2 are present, while a large part of water refers to the domains, which dissolve the acid poorly.

Keywords: 1H NMR spectroscopy, chitosan, hydration, nanosilica
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