We have succeeded in measuring the polar anchoring energy of a nematic liquid crystal (5CB) aligned on rubbed polyimide films. The polar anchoring energy gradually weakens with increasing temperature and tends to zero as the nematic-isotropic (NI) transition temperature (35.3°C) is approached. This indicates a strong correlation between the polar anchoring energy and the surface order parameter. Under the weakest rubbing condition, a polar anchoring energy of 8×10-4 J/m2 is obtained at a cell temperature T=30°C. This result indicates that, even with the weakest rubbing strength, the anchoring strength of the rubbed polyimide films is stronger than that of other alignment films.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)