J. Phys. III France
Volume 7, Numéro 5, May 1997
Page(s) 1097 - 1102
DOI: 10.1051/jp3:1997178
J. Phys. III France 7 (1997) 1097-1102

Temperature Dependence of Light Transmittance in Polymer Dispersed Liquid Crystals

F. Bloisi, C. Ruocchio and L. Vicari

Istituto Nazionale per la Fisica della Materia Dipartimento di Scienze Fisiche, Universit,  di Napoli "Federico II" Piazzale V. Tecchio, 80, 80125 Napoli, Italy

(Received 17 April 1996, accepted 29 January 1997)

Polymer Dispersed Liquid Crystals (PDLC) axe composite materials made of a dispersion of liquid crystal droplets in a polymeric matrix. When the liquid crystal is in the nematic phase, droplets appeax as optically anisotropic spheres and the material is opaque white. Sample transmittance is a function of the temperature. If the liquid crystal refractive index in the isotropic phase is equal to the one of the polymer, after the nematic-isotropic transition the material is transparent. We present a mathematical model of the dependence of the sample transmittance versus the temperature. We show the model accuracy by comparison with new experimental data.

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