Mechanism of colour changes in stretchable cholesteric films
- 21 May 2010
- journal article
- research article
- Published by Informa UK Limited in Liquid Crystals
- Vol. 37 (5), 587-592
- https://doi.org/10.1080/02678291003710474
Abstract
Large shifts of the selective reflection band and colour changes are achieved in highly viscous mixtures of cholesteric polymers and low molar mass liquid crystals subject to mechanical deformation. The liquid crystal mixture was sandwiched between two silicone strips and stretched. The colour of the material changed instantaneously during stretching, and the time for the colour to be completely restored increased with the viscosity of the polymer mixture. A quantitative model considering the material as an incompressible viscoelastic fluid is proposed. The model accurately describes colour changes (shift of the selective reflection band) and its relaxation back to the original spectral location.Keywords
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