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Issue 40, 2019
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Side-chain polysiloxane liquid crystalline elastomers from non-mesogenic components

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Abstract

Synthesis and characterisation of two new azo-based polysiloxane elastomers containing non-mesogenic monomers and different cross-linkers are described. The chemical structure of the synthesised compounds was confirmed through standard analytical techniques. Remarkably, both the elastomers displayed mesophase, despite the monomer and the cross-linker being non-mesogens. The mesophase was characterised by a combination of differential scanning calorimetry, polarising optical microscopy and X-ray diffraction experiments. The X-ray diffraction studies revealed an intercalated lamellar structure for the mesophase. Interestingly, the elastomer containing biphenyl-based cross-linker showed mesophase with an extended thermal range compared to the mesophase displayed by its counterpart containing phenyl-based cross-linker. The photoisomerisation behavior of the elastomers in solution and their photoswitchable properties in the solid state have been investigated. The monodomain sample of the elastomer showed a reversible, asymmetric bending and unbending behavior upon exposure to UV and visible light respectively, with a faster response time.

Graphical abstract: Side-chain polysiloxane liquid crystalline elastomers from non-mesogenic components

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Publication details

The article was received on 05 Jul 2019, accepted on 14 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9NJ03482J
New J. Chem., 2019,43, 15968-15978

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    Side-chain polysiloxane liquid crystalline elastomers from non-mesogenic components

    K. Mohana and S. Umadevi, New J. Chem., 2019, 43, 15968
    DOI: 10.1039/C9NJ03482J

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