Swelling Behavior of Cross-Linked Cholesteric Liquid Crystal Film in Anisotropic Solvent

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In this study, we describe the swelling behavior of a cross-linked cholesteric liquid crystal (CLC) film in a low-molecular-weight nematic LC. The swelling of the CLC film with a Grandjean texture is anisotropic; the increase in film thickness is larger than the size increase in the lateral directions. An increase in film thickness of ${\sim}34$% is measured, compared with a size increase of ${\sim}7$% in the lateral directions. The swollen film retains its texture with its characteristic reflection band shifted to a longer wavelength, corresponding to the lengthening of the helical pitch. The original polymeric CLC network can be recovered after removing the low-molecular-weight liquid crystal.
2007-11-15