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M. Mucha


Thin layers of polyester films with electrically controlled light transmission containing liquid-crystal droplets


Polimery 1992, No 6, 263


DOI: dx.doi.org/10.14314/polimery.1992.263

Summary

The results of studies on the electrooptical properties of polyester films containing dispersed nematic liquid crystal droplets with ordinary refractive index matched with the refractive index of the isotropic polymer matrix were presented. Films formed in the matrix photopolymerization process with induced phase separation had the desired electrooptical properties in the temperature range from -10 to 70°C. The parameters of the reorientation process of nematic molecules in the 20-kHz electric field were as follows: threshold voltage Up = 8 V, response timexi τ 1 = 0.4-4 ms (depending on the orienting voltage), relaxation time τ 2 = 70 ms. The film transparency is controlled by the orienting voltage of the electric field. In the opaque state (voltage is off) films attenuate about 90% light and in the transparent state (voltage is on) they transmit about 70% of the incident visible light. The thus-prepared films may be useful in electrooptical shutters.


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