SMALL LIQUID-CRYSTAL DROPLET FORMATION OF POLYMER-DISPERSED LIQUID-CRYSTAL UNDER ULTRAVIOLET-LIGHT IRRADIATION WITHOUT SHORT-WAVELENGTH COMPONENT

Citation
H. Fujikake et al., SMALL LIQUID-CRYSTAL DROPLET FORMATION OF POLYMER-DISPERSED LIQUID-CRYSTAL UNDER ULTRAVIOLET-LIGHT IRRADIATION WITHOUT SHORT-WAVELENGTH COMPONENT, JPN J A P 1, 37(3A), 1998, pp. 895-899
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Applied
Volume
37
Issue
3A
Year of publication
1998
Pages
895 - 899
Database
ISI
SICI code
0021-4922(1998)37:3A<895:SLDFOP>2.0.ZU;2-B
Abstract
The light scattering properties and polymer morphology of polymer-disp ersed liquid crystal films were investigated while adjusting the spect rum of ultraviolet light irradiation with several optical filters in t heir formation process of photopolymerization-induced phase separation . It is found that the short wavelength light component of less than 3 55 nm, which is contained in ultraviolet light to be irradiated, slows the phase separation process and results in the formation of large li quid crystal droplets. The morphological changes in the polymer may be due to undesirable decomposition products created in the nematic liqu id crystal under the short wavelength ultraviolet irradiation. A spect ral arrangement using an optical filter to eliminate the short wavelen gth light is useful in obtaining small liquid crystal droplets with a strong light-scattering effect, which increases the extinction ratio o f polymer-dispersed liquid crystal films. This formation technique wil l also improve photochemical damage in the phase separation process.