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Dual-responsive deformation of a crosslinked liquid crystal polymer film with complex molecular alignment

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Abstract

Crosslinked liquid crystal polymers (CLCPs) containing azobenzene mesogens have been developed as stimuli-responsive materials, which can undergo photodeformation and thus convert light energy into mechanical force. The deformation behavior of CLCPs is strongly influenced by the alignment of the mesogens; however, a precise control of the alignment domain at micro-scale is still a challenge. Here we report complex molecular alignment in the CLCP film by using photoalignment technology. First, azo dye SD1 is aligned in-plane by UV light with a discrete alternating striped director profile. The SD1 molecules in adjacent strips are aligned orthogonal, and the widths of the strips are controlled in several hundred micrometers by a photomask with grating patterns. Then the liquid crystal molecules in the CLCP film are aligned by SD1 through the anchoring effect on one side (SD1 side), and aligned perpendicular by the polyimide (PI) alignment layer on the other side (PI side). With these alignments, two kinds of splayed structures are formed through the depth of the film. When irradiated by UV light, the film bends toward the SD1 side with the bending direction along the diagonal of the film, determined by the resultant direction of molecular alignment on the SD1 side. When irradiated by blue light and heat, the bending direction is along the edge of the film. This dual-responsive deformable film with complex alignment is anticipated to be used in shape-changing biomedical devices, multiple controllable switches, and microactuators.

Graphical abstract: Dual-responsive deformation of a crosslinked liquid crystal polymer film with complex molecular alignment

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Publication details

The article was received on 30 Jun 2017, accepted on 24 Jul 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7SM01291H
Citation: Soft Matter, 2017, Advance Article
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    Dual-responsive deformation of a crosslinked liquid crystal polymer film with complex molecular alignment

    Q. Liu, Y. Zhan, J. Wei, W. Ji, W. Hu and Y. Yu, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM01291H

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