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Polarization-dependent deformation in light responsive polymers doped by dichroic dyes

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Abstract

Light represents a very versatile stimulus and its use to control the deformation in shape-changing polymers can take advantage of multiple parameters (such as wavelength, intensity and polarization) to be explored in order to obtain differentiated responses. Polymers with selected color responsiveness are commonly prepared by using different dyes, while a polarization-dependent control can be introduced exploiting transcis isomerization of azobenzenes. As shape-changing polymers driven by a photothermal effect are gaining more and more attention in many application fields, exploring polarization to modulate their response could enlarge the tuning parameter space and provide an insight into the material optical properties. In this work, we demonstrate the effect of light polarization on the deformation of liquid crystalline networks doped by a small amount of a push–pull azobenzene. We demonstrate how enhancing the dye alignment in the polymeric matrix leads to different deformations by orthogonal polarizations. These results demonstrate polarization as a convenient further degree of freedom besides wavelength and intensity of the light stimulus.

Graphical abstract: Polarization-dependent deformation in light responsive polymers doped by dichroic dyes

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Publication details

The article was received on 24 Sep 2018, accepted on 24 Nov 2018 and first published on 26 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01954A
Citation: Soft Matter, 2019, Advance Article
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    Polarization-dependent deformation in light responsive polymers doped by dichroic dyes

    D. Martella, S. Nocentini, F. Micheletti, D. S. Wiersma and C. Parmeggiani, Soft Matter, 2019, Advance Article , DOI: 10.1039/C8SM01954A

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