Journal
ADVANCED MATERIALS
Volume 30, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201802438
Keywords
flexible devices; liquid crystal elastomers; nonlinear mechanics; self-assembly
Categories
Funding
- Air Force Office of Scientific Research
- Materials and Manufacturing Directorate of the Air Force Research Laboratory
- NRC Research Associate Fellowship at the Air Force Research Laboratory
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Liquid crystalline elastomers (LCEs) are widely recognized for their exceptional promise as actuating materials. Here, the comparatively less celebrated but also compelling nonlinear response of these materials to mechanical load is examined. Prior examinations of planarly aligned LCEs exhibit unidirectional nonlinear deformation to mechanical loads. A methodology is presented to realize surface-templated homeotropic orientation in LCEs and omnidirectional nonlinearity in mechanical deformation. Inkjet printing of the homeotropic alignment surface localizes regions of homeotropic and planar orientation within a monolithic LCE element. The local control of the self-assembly and orientation of the LCE, when subject to rational design, yield functional materials continuous in composition with discontinuous mechanical deformation. The variation in mechanical deformation in the film can enable the realization of nontrivial performance. For example, a patterned LCE is prepared and shown to exhibit a near-zero Poisson's ratio. Further, it is demonstrated that the local control of deformation can enable the fabrication of rugged, flexible electronic devices. An additively manufactured device withstands complex mechanical deformations that would normally cause catastrophic failure.
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