вплив нИЗЬКОЕНЕРГЕТИЧНОГО Х-ВИПРОМІНЮВАННЯ НА ΤΕΡΜΟΧΡΟΜΗΙ ВЛАСТИВОСТІ ПОЛІМЕРНИХ МІКΡΟΚΟΜΠПОЗИТІВ НА ОСНОВІ КРИСТАЛІВ [NH2 (С2Н5)2]2CuC14.

The study investigates the absorption spectra of [NH₂(C₂H₅)₂]₂C_uCl₄ (DEACC) microcrystals incorporated into a polystyrene matrix. It further explores the influence of low-energy X-ray radiation on the thermochromic properties of this microcomposite. This composite, with an average microcrystal size of 200 µm, was found to possess thermochromic properties similar to those of the bulk crystal, although its discontinuous thermochromic phase transition is shifted to higher temperatures in comparison wi- th a single crystal. Such a shift is explained by surface strains that occur at the interface between the polystyrene matrix and the microcrystal. Ionizing radiation causes much more noticeable changes in the thermochromic properties of microcomposites compared to a single crystal when subjected to equivalent doses of irradiation. This influence consists in the non-trivial dependence of the thermochromic phase transition temperature obtained from the hysteresis loops D(T) on the irradiation dose. At relatively small doses of X-radiation, the phase transition temperature increases due to a mechanism similar to that of a single crystal. Specifically, this mechanism involves the breaking and rearrangement of hydrogen bonds facilitated by anionic tetrahedral complexes, resulting in their reconfiguration into a planar-square shape. Upon reaching certain critical values of the radiation dose, the radiation-induced changes become irreversible. They are primarily caused by the breaking of chemical bonds at the interface between the matrix and the microcrystal, leading to a decrease in the temperature of the thermochromic phase transi- tion. The obtained material is non-hygroscopic, mechanically stable and technological. The very simple production technology of the composites makes them suitable for creating cheap individual ionizing X-ray dose sensors. [ABSTRACT FROM AUTHOR]