Synthesis and Characterization of Polyamide Having Photoreactive Group in the Backbone and its Liquid Crystal Aligning Property

Title
Synthesis and Characterization of Polyamide Having Photoreactive Group in the Backbone and its Liquid Crystal Aligning Property
Author(s)
이승우이태진정은영[정은영]
Keywords
MOLECULAR-REORIENTATION; ANCHORING ENERGY; PRETILT ANGLE; SIDE-CHAINS; POLYIMIDE; ALIGNMENT; SURFACE; FILMS; PHOTOALIGNMENT; ORIENTATION
Issue Date
201107
Publisher
POLYMER SOC KOREA
Citation
POLYMER-KOREA, v.35, no.4, pp.350 - 355
Abstract
A soluble polyamide containing photosensitive 1,4-phenylenediacrylic acid (PDA) in main chain with biphenyl moiety was synthesized. The chemical structure of synthesized polyamide was investigated by means of (1)H NMR spectroscopy. The polymer was stable up to 280 degrees C and soluble in organic solvents, giving a good quality of thin films. The photoreaction of unpolarized UV irradiated films was investigated by means of UV-vis absorption spectroscopy and FTIR spectroscopy. and liquid crystals (LCs) alignment property was examined by exposing to linearly polarized UV light (LPUVL) of 260 similar to 380 nm. The polyamide in film has excellent photoreactivity to unpolarized UV light. Direction selective photoreaction of PDA moiety in the film was found to further induce nematic liquid-crystals to align along a perpendicular direction with respect to the electric vector of LPUVL, regardless of exposure energy of LPUVL. In addition, pretilt angle was measured by means of crystal rotation method. LPUVL-exposed polymer film induced the alignment of liquid-crystals (LC) with a pretilt angle of 0.2 similar to 0.5 degrees.
URI
http://hdl.handle.net/YU.REPOSITORY/24898
ISSN
0379-153X
Appears in Collections:
공과대학 > 화학공학부 > Articles
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