Sticking of liquid crystal on photosensitive polymer layers

• Autorzy: Gerus, I. , Glushchenko, A. , Kurioz, Y. , Reznikov, Y. , Tereshchenko, O.
• Konferencja: XV Liquid Crystal Conference: Chemistry, Physics and Applications ; (15 ; 12-17.10-2003 ; Zakopane, Poland)
• Języki publikacji: EN

Abstrakty

EN

The sticking effect on photoaligning surfaces was investigated. We demonstrated that additional irradiation of photoaligning polymers with cinnamoyl side groups with not-polarized UV-light strongly decreases their sticking parameter. We associate this effect with cross-linking of the flexible side-groups by UV light and, as a consequence, with light-induced strengthening of the photoaligning surface. Restriction of mobility of the flexible groups on the photoaligning surface (surface strengthening) resulted in depressing the sticking effect. The method of the decrease of the sticking effect by the light-induced strengthening is rather general, and it can be applied for any photoaligning materials undergoing a light-induced cross-linking of polymer fragments. For poly(vinyl 4-fluorocinnamate) the light-induced strengthening allowed us to get the record value of the sticking parameter, S₀= 0.2%, which is better than traditional rubbed polyimide surfaces provide. Such a value of the sticking parameter along with other aligning characteristics allows considering poly(vinyl 4- fluorocinnamate) as very prospective material for modern liquid crystal display technologies.

Słowa kluczowe

EN

liquid crystal; photoalingnment; sticking effect

• Czasopismo: Opto-Electronics Review
• Rocznik: 2004
• Tom: Vol. 12, No. 3
• Strony: 281-284
• Opis fizyczny: Bibliogr. 12 poz.

Twórcy

autor

Gerus, I.

• Institute of Bioorganic Chemistry and Petrochemistry, 1 Murmanskaya Str., 03-039 Kiev, Ukraine

autor

Glushchenko, A.

• Liquid Crystal Institute, Kent State University, Kent, 44240 OH, USA

autor

Kurioz, Y.

• Institute of Physics, 46 Nauki Ave., 03-039 Kiev, Ukraine,

autor

Reznikov, Y.

• Institute of Physics, 46 Nauki Ave., 03-039 Kiev, Ukraine

autor

Tereshchenko, O.

• Institute of Physics, 46 Nauki Ave., 03-039 Kiev, Ukraine

Bibliografia

• 1. P. Chatelain “Orientation of liquid crystal”, Bull. Soc. Franc. Miner. 66, 105 (1943).
• 2. J. Cognard, “Alignment of nematic liquid crystals and their mixtures, Mol. Cryst. Liq. Cryst., Supplement, 1982.
• 3. W.M. Gibbons, P.J. Shannon, S.T. Sun, and B.J. Swetlin, “Surface-mediated alignment of nematic liquid crystals with polarized laser light”, Nature 351, 49 (1991).
• 4. A.G. Dyadyusha, T.Ya. Marusii, V.Yu. Reshetnyak, Yu.A. Reznikov, and A.I. Khizhnyak “Orientational effect due to change in the anisotropy of the interaction between a liquid crystal and a bounding surface”, JETP Lett. 56, 17-21 (1992).
• 5. M. Schadt, K. Schmitt, V. Kozenkov, and V. Chigrinov “Surface-induced parallel alignment of liquid crystals by linearly polymerized photopolymers”, Jpn. J. Appl. Phys. 31, 2135 (1992).
• 6. D. Andrienko, A. Dyadyusha, A. Iljin, Yu. Kurioz, and Yu. Reznikov, “Measurement of azimuthal anchoring energy of nematic liquid crystal on photoaligning polymer surface, Mol. Cryst. Liq. Cryst. 321, 271-281 (1998).
• 7. Yu. Kurioz, V. Reshetnyak, and Yu. Reznikov, “Orientation of a liquid crystal on a soft photoaligning surface”, Mol. Cryst. Liq. Cryst. 375, 535-541 (2002).
• 8. D. Andrienko, A. Dyadyusha, Yu. Kurioz, Yu. Reznikov, F. Barbet, D. Bormann, M. Warenghem, and B. Khelifa, “Photoalignment of pentyl-cyanobiphenyl on the fluorinated polyvinil-cinnamates induced by UV and visible light”, Mol. Cryst. Liq. Cryst. 329, 219-226 (1999).
• 9. L. Bugayova, I. Gerus, A. Glushchenko, A. Dyadyusha, Yu. Kurioz, V. Reshetnyak, and Yu. Reznikov, “Non-monotonic exposure dependence of the pretilt angle and surface polarity of the photo-orientant F-PVCN”, Liq. Cryst. 29, 209-212 (2002).
• 10. S. Shiyanovskii, A. Glushchenko, and Yu. Reznikov, “Tensor and complex anchoring in liquid crystals”, Phys. Rev. E 62, (2000).
• 11. D. Andrienko, Yu. Kurioz, Yu. Reznikov, M. Nishikava, and J. West. “Control of the anchoring energy on polymide layers by irradiation of depolarized UV-light”, Jpn. J. Appl. Phys. 39, 1217 (2000).
• 12. A. Lien, “Image sticking measurement of LCDs”, SID Digest, 203 (1997).