This paper presents the results of studies on the thermogravimetric properties of chitosan and its Schiff bases. The authors investigated the structure of the Schiff base (Xz-G) using molecular modeling in the HyperChem 8.0 program. The observed thermal phenomena provide insight into the stability and transitions of Schiff bases, as well as demonstrate that the structure of Schiff bases obtained from chitosan and glutaraldehyde is characterized by the bonding of amino groups with carbonyl groups.