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Abstract
The spectral selectivity of the light transmitted by Polymer Dispersed Liquid Crystal films with nanosized liquid crystalline droplets is investigated. We focus on the impact of the method of preparation on the optical transmission versus wavelength. Materials elaborated from selected mixtures of resin A* and the liquid crystal E7 are considered. A UV-vis spectrophotometer is used to evaluate the spectral transmission of light of the fabricated films in the range of wavelengths from 200 to 1100 nm. Spectral responses are examined in terms of the curing conditions of the initial monomer/liquid crystal/photoinitiator mixtures. The concentrations of photoinitiator and liquid crystal were changed in order to find the best conditions to obtain nanosized droplets within the polymer matrix. The salient features of the method of preparation adopted to obtain PDLC films with nanosized droplets and controlled distribution are discussed.