ИСТИНА

Chitosan is a promising material for the manufacture of edible films and medicine, but this biopolymer has a low solubility and brittleness, so there is a need of chemical modification of chitosan for the creation on its basis of the composites with novel properties [1]. In this work, we studied the initial samples of chitosan and composites based on it with iron (II) hydroxide and sulfate, as well as samples of the same materials subjected to various types of treatment: ultrasound, low temperature, followed by defrosting and microwave activation. The profiles of single diffraction reflections of hkl samples are studied. The parameters of the elementary cells are calculated. With the help of profile analysis, the average sizes of OCD and the values of microdeformations in the studied samples were calculated. The influence of the effects on the microstructure of samples of chitosan and its complexes with iron (II) hydroxide and sulfate was found. It is shown that the processing of samples after exposure to various temperatures and microwave activation leads to an improvement in the crystal structure. Treatment in a microwave reactor has the most noticeable effect on improving the structure of chitosan. Ultrasonic treatment leads to some deterioration of the crystal structure of chitosan. Similar changes occur in chitosan composites with iron (II) hydroxide and sulfate. The crystal structure of chitosan composites with iron (II) hydroxide and sulfate is best improved by microwave activation and low temperature exposure to samples with subsequent defrosting. Ultrasound treatment somewhat worsens the structure of composites.