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Proceedings Paper

Role of aggregates in the wavelength-dependent photochemistry of a main-chain liquid-crystalline polyaryl cinnamate
Author(s): David Creed; Anselm C. Griffin; Charles E. Hoyle; Krishnan Venkataram
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Paper Abstract

Several aspects of the thermal and photochemical behavior of a main-chain nematic liquid crystalline polyarylcinnamate are discussed. Hypochromic and other effects that are attributed to chromophore aggregation are observed in the UV-VIS spectra of heated polymer films. These effects are more pronounced upon thermal annealing. They can only be eliminated by recasting the film out of solution. Irradiation (313nm) of the polymer leads to cyclobutane dimer and photo-Fries rearrangement products. Aggregated chromophores seem to form cyclobutane products in preference to photo-Fries products. Dimer to photo-Fries product ratios are reported as a function of phase type. Preliminary indications are that long-wavelength (365nm) excitation of aggregates leads to preferential cyclobutane formation. Only weak fluorescence can be observed from polymer films and this is tentatively attributed to monomeric chromophores. There is no evidence of emission from excited aggregates.

Paper Details

Date Published: 1 April 1990
PDF: 8 pages
Proc. SPIE 1213, Photopolymer Device Physics, Chemistry, and Applications, (1 April 1990); doi: 10.1117/12.18022
Show Author Affiliations
David Creed, Univ. of Southern Mississippi (United States)
Anselm C. Griffin, Univ. of Southern Mississippi (United States)
Charles E. Hoyle, Univ. of Southern Mississippi (United States)
Krishnan Venkataram, Univ. of Southern Mississippi (United States)

Published in SPIE Proceedings Vol. 1213:
Photopolymer Device Physics, Chemistry, and Applications
Roger A. Lessard, Editor(s)

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