SPATIAL-DISTRIBUTION, LIGHT RESISTANCE AND LIGHT STABILIZATION OF DYESTUFF MOLECULES IN POLYMERIC MATRICES

The distibution of the dyestuff and stabilizer molecules in the polymeric matrices of cellulose hydrate and polyamide were investigated. Also considered were such distributions in the specimens of the textiles made of natural and artificial fibers with the help of the diffusional and sorptional method. The comparison of these results with the coloration light resistance in the investigated systems was then made. The luminiscence method was used to determine the local concentrations. The analysis of the experimental results has been carried out with the assumption of the equally probable molecular distribution of the low-molecular admixtures across the volume in the certain zones of the polymeric matrix. A measure of the distribution heterogeneity is the specific volume of these zones reative to the polymetric matrix volume. It has been established that the molecules of the dyes and stabilizers are not evenly distributed across the polymeric matrix volume. The volume of the distribution zones of the low-molecular admixtures (determined by the material structure, admixture nature and introduction method) can comprise up to 5% of the matrix volume. The close spatial distribution of the dye and light stabilizer is the determining condition of the efficiency of the stabilizing action. The investigation of mutual distribution of the dye and light stabilizer molecules in the diffusional saturation of the specimens made of solutions was carried out with both the model systems (industrial films of cellulose hydrate/CH/ and polyamide/PA/PIK-6 washed off from admixtures) and real textile materials of a different nature.