MEROCYANINE-SPIROPYRAN PHOTOCHEMCIAL TRANSFORMATION IN POLYMERS, PROBING EFFECTS OF RANDOM MATRICES.

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Abstract

Isomerization kinetics of the merocyanine-spiropyran transformation in several poly(alkylo acrylates) are detected by time-resolved absorption spectroscopy. The decay of the colored merocyanine exhibits significant deviations from first-order patterns. The energy of activation can be separated into a stabilization energy for the isomer and an activation inherent to the amorphous matrix by observing the decoloration patterns for the corresponding photoisomerization. These observations can be explained by matrix effects in the isomerization modeled by statistics and fluctuations of matrix-site energies.

Original languageEnglish (US)
Pages (from-to)923-929
Number of pages7
JournalMacromolecules
Volume21
Issue number4
Publication statusPublished - Apr 1988
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Chemistry

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