Abstract
A polymer-dispersed chiral liquid crystal (PDCLC) film was fabricated by rapid polymerization of a trifunctional pre-polymer. The effect of applied voltage on optical rotation and transmittance of the PDCLC film was measured by a polarimeter (PerkinElmer Model 341) and was explained by the free-energy minimization process. The dispersion and size of liquid crystal (LC) droplets were observed by polarizing optical microscopy (POM) and Fourier transform infrared (FTIR) spectrometer with spectrum spotlight FTIR imaging system. The dispersion of LC droplets was depicted by the characteristic absorption peak of the −C≡N group, which represents the LC droplets. The intensity of absorption by the −C≡N group was shown by the peak height in the three-dimensional FTIR (3D-FTIR) spectrum. The size of LC droplets was assessed through an enlarged two-dimensional single-wavenumber FTIR (2D-FTIR) spectrum, and was found to be consistent with the results obtained by POM.
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