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52.4L: Late News Paper : Continuous Control of Spatially‐Homogeneous Nematic Pretilt Angle Using Mixtures of Two Polyimide Alignment Materials
Author(s) -
Lee JiHoon,
Clarke Christopher M.,
Rosenblatt Charles,
Kang Daeseung
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256907
Subject(s) - polyimide , materials science , planar , liquid crystal , homogeneous , composite material , optics , optoelectronics , thermodynamics , physics , layer (electronics) , computer science , computer graphics (images)
We show that certain mixtures of polyimides that induce planar and vertical alignment do not microphase separate, yet provide continuous control of pretilt angle vs. their relative concentration. The results, which demonstrate that variable pretilt does not require microphase separation, are explained by the addition of fourth order terms to the usual Rapini‐Papoular surface energy.