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Synthesis and Photopolymerization of Discotic Liquid Crystals Containing Hydrogen Bondings and Two Polymerizable Groups  

Lee Jun-Hyup (Hyperstructured Organic Materials Research Center and School of Chemical and Biological Engineering, Seoul National University)
Lee Seung-Jun (Hyperstructured Organic Materials Research Center and School of Chemical and Biological Engineering, Seoul National University)
Jang Ji-Sun (Hyperstructured Organic Materials Research Center and School of Chemical and Biological Engineering, Seoul National University)
Jho Jae-Young (Hyperstructured Organic Materials Research Center and School of Chemical and Biological Engineering, Seoul National University)
Publication Information
Polymer(Korea) / v.30, no.5, 2006 , pp. 373-379 More about this Journal
Abstract
Polymerizable discotic liquid crystals containing diacetylene and acryloyl groups were formed through hydrogen bonding between phloroglucinol core and polymerizable pyridine derivatives, and their photopolymerization behavior was investigated. The discotic complexes exhibited discotic columnar and rectangular columnar mesophases depending on the number of aromatic rings. Photopolymerization of the discotic complexes was carried out by UV irradiation in the liquid crystalline state. IR and UV-Vis spectroscopy affirmed that diacetylene and acryloyl groups were selectively Polymerized, and that crosslinked polymers containing short conjugated diacetylene oligomers were produced by 1,4-addition. X-ray diffraction experiment showed that the columnar order in the discotic complex containing phenyl-pyridine moiety was maintained after photopolymerization, and that the rectangular columnar order in he discotic Complex with biphenyl units was changed to the lamellar order.
Keywords
discotic liquid crystal; hydrogen bonding; photopolymerization;
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