KIEE International Transactions on Electrophysics and Applications

The Korean Institute of Electrical Engineers (대한전기학회)
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Monofunctional Monomer Effects of The Reflection Mode & Transmission Mode of Holographic Polymer Dispersed Liquid Crystals

  • Park, Min-Sang (Department of Polymer Science & Engineering, Pusan National University) ;
  • Cho, Young-Hee (Department of Polymer Science & Engineering, Pusan National University) ;
  • Kim, Byung-Kyu (Department of Polymer Science & Engineering, Pusan National University)
  • Published : 2001.09.01
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Abstract

Holographic polymer dispersed liquid crystals (HPDLCs) have fabricated by irradiating an Ar-ion laser ( ${\lambda}$=514nm) at various intensity on LC/acrylate monomer mixtures which were sandwitched between two ITO coated glass plates. Monomer systems were composed of dipentaerythritol-hydroxy penta acrylate (DPHPA, f=5)/monofunctional acrylate monofunctional monomers. The LC used in this system was E7 (BL001, Merck). Gratings were fabricated by periodic interference of twobeams. Reflection efficiency-irradiation intensity-monomer type relationships were obtained from the UV-visible spectra of the HPDLC films. Peaks were found at a bit smaller wavelength than 514nm, due to the shrinkage of mixture volume upon polymerization. Real time measurements of diffraction efficiency have been obtained according to monomer types and LC contents.

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