Surface free energy of chosen polyimides used for alignment of liquid crystals

Jerzy Borycki; Marcin Kostrzewa; Jerzy Kedzierski

doi:10.1117/12.581210

1 September 2004 Surface free energy of chosen polyimides used for alignment of liquid crystals

Jerzy Borycki, Marcin Kostrzewa, Jerzy Kedzierski

Proceedings Volume 5565, XV Conference on Liquid Crystals; (2004) https://doi.org/10.1117/12.581210
Event: XV Conference on Liquid Crystals, 2003, Zakopane, Poland

Abstract

According to classical method polyimides were obtained in two-step polycondensation process via 10% solutions of poly(amic acid)s in dimethylformamide (DMF). The indium tin oxide (ITO)-glass plates or glass plates were spin-coated with the 1% (w/w) poly(amic acid)s solutions and then the solvent was evaporated. The aligning polyimide layers were prepared by thermal imidization. Polyimide layers on indium tin oxide (ITO)-glass plates were prepared by thermal imidization at 250°C for 4 h. Their surface free energy and its components were determined. Polyimide films on soda glass with various degree of imidization were prepared by thermal treatment at 180°C, 200°C, 220°C and 250°C. Evaluation of rubbed polyimide layers wettability by four nematic liquid crystals (5CB, 6CB, 6CHBT and 8CHBT) was carried out.

Citation Download Citation

Jerzy Borycki, Marcin Kostrzewa, and Jerzy Kedzierski "Surface free energy of chosen polyimides used for alignment of liquid crystals", Proc. SPIE 5565, XV Conference on Liquid Crystals, (1 September 2004); https://doi.org/10.1117/12.581210

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