Effect of polymer-dispersed liquid crystal morphology on its optical performance

• Autorzy: Kłosowicz S. J. , Aleksander M.
• Konferencja: XV Liquid Crystal Conference: Chemistry, Physics and Applications ; (15 ; 12-17.10-2003 ; Zakopane, Poland)
• Języki publikacji: EN

Abstrakty

EN

The effect of the preparation method and its parameters and system composition on the polymer-dispersed liquid crystal morphology are described including size, shape, and concentration of liquid crystal droplets. Three different methods of polymer-dispersed liquid crystal preparation – encapsulation, solvent-induced phase separation, and photopolymerization- induced phase separation have been studied. It has been confirmed that the mean size of liquid crystal droplets is proportional to the liquid crystal concentration and approximately inversely proportional to the solidification rate. Depending on the preparation parameters it is possible to obtain, from the same components, a composite in which liquid crystal droplets’ size differs by four orders of magnitude. The driving voltage decreases while switching time increases with a size of liquid crystal droplets. The composites containing elongated liquid crystal droplets exhibit different electrooptical properties than those containing spherical droplets. Generally, changing composite morphology one can adjust electrooptical performance of polymer-dispersed liquid crystal.

Słowa kluczowe

EN

polymer-dispersed liquid crystals; morphology; electrooptical properties

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2004
• Tom: Vol. 12, No. 3
• Strony: 305--312
• Opis fizyczny: Bibliogr. 18 poz.

Twórcy

autor

Kłosowicz S. J.

• Institute of Applied Physics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland

autor

Aleksander M.

• State Higher Vocational School, 1 Staszica Str., 33-300 Nowy Sącz, Poland

Bibliografia

• 1. G.P. Crawford and S. Uumer, “Historicalperspective of liquid crystals confined to curved geometries”, in Liquid Crystals in Complex Geometries, pp. 1-19, edited by G.P. Crawford and S. Uumer, Taylor&Francis, London, 1996.
• 2. H.S. Kitzerow, “Polymer dispersed and polymer stabilized chiral liquid crystals”, in Liquid Crystals in Complex Geometries, pp. 187-219, edited by G.P. Crawford and S. Uumer, Taylor&Francis, London, 1996.
• 3. J.W. Doane, “Polymer dispersed liquid crystals”, vol. 1, pp. 361-395, in Liquid Crystals: Applications and Uses, ed. by B. Bahadur, World Scientific, Singapore, 1990, vol. 1.
• 4. M. Pranga, K.L. Czupryński, and S.J. Kłosowicz, “Polymer-dispersed liquid crystals for thermosensitive foils and paints”, Proc SPIE 4147, 394-399 (2000).
• 5. H. Molsen and H.S. Kitzerow, “Bistability in polymer-dispersed ferroelectric liquid crystals”, J. Appl. Phys. 75, 710-716 (1994).
• 6. V. Vorflusev and S. Kumar, “Electrooptical properties of thin PDFLC films prepared by TIPS and PIPS methods”, Ferroelectrics 213, 117 (1998).
• 7. R.L. Sutherland, V.P. Tondiglia, L.V. Natarajan, T.J. Bunning, and W.W. Adams, “Electrically switchable volume gratings in polymer-dispersed liquid crystals”, Appl. Phys. Lett. 64, 1074-1076 (1994).
• 8. M. Macchione, D. Cupelli, G. De Filpo, F.P. Nicoletta, and G. Chidichimo, “Morphology and electro-optical properties of reverse mode polymer dispersed liquid crystals”, Liquid Crystals 27, 1337-1341 (2000).
• 9. A.V. Konkolovich, V.V. Presnyakov, V.Ya. Zyryanov, V.A. Loiko, and V.F. Shabanov, “Interference quenching of light transmission through a monolayer film of polymer dispersed nematic liquid crystal”, J. Exp. Theor. Phys. Lett. 71, 486-488 (2000).
• 10. V.Ya. Zyryanov, “Uniaxially oriented films of polymer dispersed liquid crystals: preparation, physical properties, and display applications”, 12th International Symposium on Advanced Display Technologies, SID Russia Chapter, 141-144 (2003).
• 11. M. Jazbinsek, I. Drevensek-Olenik, M. Zgonik, A.K. Fontecchio, and G.P. Crawford, “Characterization of holographic polymer dispersed liquid crystal transmission gratings,” J. Appl. Phys. 90, 3831-3837 (2001).
• 12. S.J. Kłosowicz, K.L. Czupryński, and W. Piecek, “Polymer dispersed ferroelectric and antiferroelectric liquid crystals”, Mol. Cryst. Liq. Cryst. 351, 343-349 (2000).
• 13. S.J. Kłosowicz, K.L. Czupryński, and W. Piecek, “Polymer-dispersed antiferroelectric liquid crystals”, Mol. Cryst. Liq. Cryst. 367, 305-312 (2001).
• 14. S.J. Kłosowicz, “Optimization of nematic liquid crystal mixtures for PDLC”, Proc. SPIE 2372, 258-261 (1995).
• 15. S.J. Kłosowicz and J. Zieliński, “Liquid crystal - polimer composites - is the baby growing up?”, Proc. SPIE 3318, 364-370 (1998).
• 16. M. Aleksander and S.J. Kłosowicz, “Effect of preparation method on PDLC morphology and properties”, 15th Liquid Crystal Conference: Chemistry, Physics and Applications, Zakopane 2003. (Proc. SPIE in print).
• 17. M. Aleksander and S.J. Kłosowicz, “PDLC composites containing elongated liquid crystal droplets”. (submitted to Biuletyn WAT 2003).
• 18. S.J. Kłosowicz, L.R. Jaroszewicz, and E. Nowinowski-Kruszelnicki, “Optical effects in polymer-dispersed liquid crystal - fibre optic devices”, Mol. Cryst. Liq. Cryst. 321, 323-331 (1998).