Persistent spectral hole burning of resazurin and resorufin in poly(methyl methacrylate) in the presence and absence of N,N,N'N'-tetramethyl-p-phenylenediamine

Article Abstract:

The persistent spectral hole burning (PHSB) phenomenon was measured to determine the environmental changes in the anionic dye resazurin sodium salt in polymer matrixes. The PHSB in the ionic organic dye resorufin was also measured. The effect of the addition of the neutral, electron-donating molecule N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) were examined. Both dyes showed significant increases in their hole widths, but no new band was formed in the absorption spectrum. The findings demonstrate that the responses of both dyes to TMPD were influenced by their physical structures.

Polymers, Chemistry, Photosensitizing compounds, Photosensitizing agents, Dyes and dyeing, Dye chemistry

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Photochromism and thermochromism of phenanthrospirooxazine in poly(alkyl methacrylates)

Article Abstract:

The photochromism and thermochromism of phenanthrospirooxazine in poly(alkyl methacrylates) have been studied. Spirooxanes are photochromic materials formed from two heterocyclic parts bound together by a single tetrahedral sp(super 3) carbon atom. The results are given in terms of a distribution model and a matrix relaxation model. The latter is used in computing for the relaxation time of the matrix. It has been observed that the relaxation is the result of local movements while the kinetic parameters exhibit Arrhenius-type behavior in all temperature ranges.

Research, Plastic films, Thin films, Optical properties, Relaxation phenomena, Relaxation (Physics), Photochromic materials, Thermochromism

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