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Articles by B. Y. Zhang
Total Records ( 2 ) for B. Y. Zhang
  X. Y. Xu , B. Y. Zhang , L. X. Wang and W. M. Gu
  Two series of hydrogen-bonded side-chain liquid crystal polymers have been prepared by mixing components containing carboxyl acid and pyridyl-based fragments. We have focused our attention on the effect that the position of the hydrogen bond donor or acceptor site attached to the side-chain backbone has on the hydrogen-bonding interactions and liquid crystalline phase transitions of the system. The liquid crystalline behaviour of the complexes is studied using Fourier transform infrared spectroscopy, differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The results indicate that the phase transition temperatures of the complexes are influenced by the site of hydrogen-bonding.
  J. H. Wang , B. Y. Zhang , W. Z. Qu , H. S. Chu and H. Li
  It is known that the electro-optical behaviour of polymer-dispersed liquid crystals depends on the separation of the polymer and liquid crystal phases. The morphology of the liquid crystal domains depends on the nature of the chemical and physical processes occurring during domain formation. This work discusses the two-phase morphology found in an acrylate-based system that develops during polymerisation-induced phase separation. The effect of the dopant nano-graphite on the polymerisation and electro-optical properties are discussed. UV/VIS and time-resolved Fourier transform infrared spectroscopy is used for monitoring the polymerisation of the polymer-dispersed liquid crystals. The electro-optical properties of the polymer-dispersed liquid crystal films are measured using a polarimeter (PerkinElmer Model 341). The morphology of the liquid crystal droplets in the polymer matrix is probed by polarising optical microscopy and Fourier transform infrared spectroscopy images. The threshold voltage of the polymer-dispersed liquid crystals is dramatically decreased because of the increased conductivity of the polymer matrix on doping by nano-graphite.
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