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Issue 8, 2012
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Light sensitive antiferroelectric achiral copolymers

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Five copolymers were prepared by polymerization of azo-benzene methacrylate monomers in solution using AIBN as initiator. The mesophases were observed by a polarizing light microscope which showed tilted smectic C phases for almost all samples. One of them shows just one orthogonal smectic A2 phase. The X-ray diffraction patterns reveal the existence of bilayer smectic C2 mesophases. The spontaneous polarization and pyroelectric response are reported showing an antiferroelectric behaviour for three of the copolymers. The polar phase has to do with a preferable arrangement of side chains in a syndiotactic fashion, which promotes the formation of anticlinicity in the polymer net. We probe that it is possible to induce orientation of the chromophores subjected to irradiation with UV/Vis light and that it is proportional to the amount of monomers without the OH group within the copolymers. This is so far a unique manifestation of polar ordering due to the syndiotactic lateral distribution of mesogens bearing an OH group in a tilted smectic C2 phase.

Graphical abstract: Light sensitive antiferroelectric achiral copolymers

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Publication details

The article was received on 31 May 2011, accepted on 04 Nov 2011 and first published on 11 Jan 2012

Article type: Paper
DOI: 10.1039/C1JM12431E
J. Mater. Chem., 2012,22, 3340-3347

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    Light sensitive antiferroelectric achiral copolymers

    E. A. Soto-Bustamante, C. M. González-Henríquez, R. O. Vergara-Toloza and W. Haase, J. Mater. Chem., 2012, 22, 3340
    DOI: 10.1039/C1JM12431E

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