Title

A Simple and Material Independent Method for the Determination of Anchoring Properties of Rubbed Polyimide Surfaces

Publication Title

Japanese Journal of Applied Physics

Publication Date

12-15-1999

Document Type

Article

DOI

10.1143/JJAP.38.L1538

Disciplines

Physics

Abstract

A method to determine liquid crystal (LC) anchoring properties, that exploits the changes induced in a rubbed polyimide (PI) film upon exposure to linearly polarized ultra-violet light, has been devised. The width of the Gaussian PI chain distribution is determined from the measured rotation of the PI film's index ellipsoid, the long axis of which is also the LC easy axis, as a function of exposure time. A quasi-microscopic surface free energy is used to model the anchoring properties. This approach provides a simple LC material independent method for determining the LC anchoring properties.

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