Key words: supercritical fluid impregnation, supercritical carbon dioxide, thermoplastic polymers, photochrome indoline spirocompounds, toluene, spectrophotometry
It is demonstrated that the generation of isomer «colored» merocyanine forms B and Вх of the indoline spiroantrooxazine (SAO), which was introduced into fluoroplast F-42 matrix from supercritical carbon dioxide (SC-CO2), depends on the volume content of toluene. Toluene in this medium serves as aromatic electron-donating co-solvent. It is shown that the observed ratios of spiroantrooxazine forms content can be described in the framework of kinetic scheme that assumes the SAO molecules relocation between two phases — SC-CO2 and polymer. The «blue» B form is represented by SAO molecules solvated by toluene and localized near certain matrix fragments. Id est, this form is a part of a triple SAO/F-42/toluene complex. The formation of the «red» colored Вх form is due to the coordination of non-solvated SAO molecules penetrating into the matrix from SC-CO2 in the nearest environment of matrix F-42 polymer fragments.