Spectrophotometric investigation of photoinduced processes in methacrylic azobenzene-containing polymers

International Conference on Holography, Optical Recording, and Processing of Information Pub Date : 2006-05-20 DOI:10.1117/12.676859

I. Mancheva, T. Petrova, Violeta Dragostinova, L. Nikolova

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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.

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含甲基丙烯酸偶氮苯聚合物光诱导过程的分光光度法研究

研究了四种含甲基丙烯酸偶氮苯共聚物的光诱导过程。该材料是由发色团单体和甲基丙烯酸甲酯自由基型聚合合成的。共聚物的不同之处在于发色团单体的浓度(P1 - 5mol%， P2 - 23mol%， P3 - 5mol%和P4 - 100mol%)。前三种聚合物是无定形的，第四种(P4)是液晶的。我们已经确定，在非偏振紫外光和线偏振Ar光束照射下获得的顺式偶氮苯的光平衡浓度随着发色团单体浓度的增加而降低:聚合物P1的光平衡浓度最高，P4的光平衡浓度最低。同样，由偏振光引起的观察到的二色性值可以与发色团浓度联系起来。但在这里，较低的发色团浓度对应于光二色性的较低值。然而，这并不适用于P4聚合物，这很可能是由其液晶特性引起的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Conference on Holography, Optical Recording, and Processing of Information

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