Comparison of Liquid Crystal Alignments on Rubbed and Linearly Polarized UV-Irradiated Polyimide Surfaces

Title
Comparison of Liquid Crystal Alignments on Rubbed and Linearly Polarized UV-Irradiated Polyimide Surfaces
Author(s)
이승우장아름길은경배준채복남[채복남]
Keywords
MOLECULAR-REORIENTATION; SIDE-CHAINS; PHOTOREACTIVE POLYIMIDE; POLYMER SURFACES; PRETILT ANGLE; THIN-FILMS; ORIENTATION; LAYER; MORPHOLOGY; BACKBONE
Issue Date
201208
Publisher
TAYLOR & FRANCIS LTD
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.563, pp.10 - 18
Abstract
Liquid crystals' surface morphologies, molecular reorientation, alignment, and nematic pretilt angles on polyimide surfaces were studied. The polyimide molecules contained cinnamoyl side groups; they were treated by irradiation with linearly polarized ultraviolet light or rubbing. Root-mean-square surface roughnesses over 1.0 mu m x 1.0 mu m areas were 0.282, 0.260, and 2.073 nm for untreated, irradiated (1.0 J/cm(2)), and rubbed (strength, 65 cm) films, respectively. The optical axis of the irradiated film was perpendicular to the light's direction of polarization; in the rubbed film it was parallel to the rubbing direction. Rubbing resulted in higher retardation than irradiation. The orientations of liquid crystal molecules on the films coincided with their polymer chain orientations. Fabricating LC cells with rubbed film resulted in higher pretilt angles than using irradiated film.
URI
http://hdl.handle.net/YU.REPOSITORY/27574http://dx.doi.org/10.1080/15421406.2012.687890
ISSN
1542-1406
Appears in Collections:
공과대학 > 화학공학부 > Articles
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