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Issue 27, 2017
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Effect of secondary relaxation transitions on photo-induced anisotropy in glassy azobenzene-functionalized polymers

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Abstract

We propose a physical mechanism for the photo-induced orientation alignment of azo-dyes incorporated in polymers at temperatures far below the glass transition temperature. Using polarized FT-IR spectroscopy, we show that optical dichroism undergoes an observable change at the β-relaxation transition of the azo-polymer when the mobility of the short backbone fragments is increased. We explain this effect using temperature-dependent local strains that occur within the polymer backbones in a glassy state. These strains underlie the enhanced thermal relaxation that drives the orientation kinetics.

Graphical abstract: Effect of secondary relaxation transitions on photo-induced anisotropy in glassy azobenzene-functionalized polymers

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Publication details

The article was received on 15 Apr 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01652B
Citation: J. Mater. Chem. C, 2017,5, 6828-6833
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    Effect of secondary relaxation transitions on photo-induced anisotropy in glassy azobenzene-functionalized polymers

    S. S. Kharintsev, K. L. Shukhina, A. I. Fishman and S. K. Saikin, J. Mater. Chem. C, 2017, 5, 6828
    DOI: 10.1039/C7TC01652B

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