Film morphology and electro-optical behaviour of Polymer Dispersed Liquid Crystals (PDLC) made by the standard mixture NOA 65/E7 have been studied for different exposure times and intensities of UV curing light. Special attention has been devoted to the study of the effects of curing parameters on film morphology, which were analysed by means of scanning electron microscopy (SEM). UV intensity has been proved to play an important role in the phase separation process. It affects not only liquid crystal droplets size, but also the morphological uniformity of PDLC samples and the extent to which phase separation is complete. A simple interpretation based on the temperature dependence of the free energies involved in the curing process is proposed. As we expected electro-optical responses show to be strictly related to film morphology.
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Bella et al. (1998) studied this question.
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