Electro-optical properties based on light scattering controlled by a.c. electric field were investigated for polymer/(liquid crystal) composite films. Scanning electron microscopic observation for the matrix polymer after extraction of LC with methanol exhibited that LC molecules were continuously embedded in a three-dimensional spongy network of polymer matrix. Such a membrane system with many optical interfaces plays an important role on light scattering without an imposed electric field. A high contrast of light-switching was observed; 3% transmittance of the as-cast composite film changed to 81% with the response time of 0.3 ms in the case of an applied 250 Vp-p a.c. electric field of 10 kHz at 333 K.
|Number of pages||4|
|Publication status||Published - 1989|