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Mechanisms Of Liquid Crystal Alignment On Buffed Polyimide Surfaces

Published online by Cambridge University Press:  15 February 2011

Hirotsugu Kikuchi ,
J. A. Logan  and
Do Y. Yoon
Hirotsugu Kikuchi
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120–6099
J. A. Logan
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120–6099
Do Y. Yoon
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120–6099
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Abstract

The surfaces of poly(amic acid) and cured polyimide films, subjected to different buffing and cure profiles, have been examined by atomic force microscopy (AFM). The ability of these buffed polymer surfaces to align nematic and chiral smectic C liquid crystals were also investigated. These studies show that the presence of microgrooves on buffed polymer surfaces are not necessary for alignment of liquid crystals. Rather, it is concluded that the liquid crystal alignment is mainly caused by the anisotropic intermolecular interactions between liquid crystal molecules and the polymer chains oriented by buffing. For the alignment of smectics, both the degree of order and mechanical properties of polyimide films are found to be important factors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 345: Symposium M – Flat Panel Display Materials , 1994 , 247
Copyright
Copyright © Materials Research Society 1994

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