Modification of Chitosan via Grafting of Glycolic Acid Followed by Polycondensation during Heat Treatment

The modification of chitosan via grafting of glycolic acid and subsequent polycondensation during heat treatment have been studied. The formation of copolymers, the degree of amidization of amino groups, and the length of side polyglycolide chains are investigated by IR spectroscopy and gravimetry. The structural features and surface behavior of the films based on chitosan modified by poly(glycolic acid) are examined by X-ray diffraction and AFM. The grafting of side polyglycolide chains leads to marked changes in the chitosan structure. The study of the sorption behavior of the films based on the modified chitosan confirms the hydrophobization of chitosan via grafting of poly(glycolic acid).