Spectrophotometric investigation of photoinduced processes in methacrylic azobenzene-containing polymers

Ivanka Mancheva; Tsveta Petrova; Violeta Dragostinova; Ludmila Nikolova

doi:10.1117/12.676859

9 June 2006 Spectrophotometric investigation of photoinduced processes in methacrylic azobenzene-containing polymers

Ivanka Mancheva, Tsveta Petrova, Violeta Dragostinova, Ludmila Nikolova

Proceedings Volume 6252, Holography 2005: International Conference on Holography, Optical Recording, and Processing of Information; 62520M (2006) https://doi.org/10.1117/12.676859
Event: Holography 2005: International Conference on Holography, Optical Recording, and Processing of Information, 2005, Varna, Bulgaria

Abstract

The photoinduced processes in four methacrylic azobenzene-containing copolymers have been investigated. The materials have been synthesized by radical type polymerization of the chromophore monomer and methylmethacrylate. The copolymers differ only in the concentration of chromophore monomers (P1 - 5mol%, P2 - 23mol%, P3 - 5Omol% and P4 - 100mol%). The first three polymers are amorphous and the fourth (P4) is liquid-crystalline. We have established that the photoequilibrium concentration of cis-azobenzenes obtained on irradiation with nonpolarized UV light and with a linearly polarized Ar beam decreases with increasing concentration of chromophore monomers: it is highest for polymer P1 and lowest for P4. Similarly, values for the observed dichroism induced by polarized light can be linked to chromophore concentration. But here lower values of the concentration of chromophores correspond to lower values for photodichroism. This, however, does not hold for the P4 polymer and this is most probably caused by its liquid-crystalline properties.

Citation Download Citation

Ivanka Mancheva, Tsveta Petrova, Violeta Dragostinova, and Ludmila Nikolova "Spectrophotometric investigation of photoinduced processes in methacrylic azobenzene-containing polymers", Proc. SPIE 6252, Holography 2005: International Conference on Holography, Optical Recording, and Processing of Information, 62520M (9 June 2006); https://doi.org/10.1117/12.676859

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KEYWORDS

Polymers

Chromophores

Ultraviolet radiation

Dichroic materials

Polarization

Absorbance

Absorption

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