Photochromic Characteristic of Cationic Photoinitiator and Fluorane Dye System Microencapsulated in Sub-micrometre Scale

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  • Lai Weidong
    Department of Physics Science and Technology, Hebei University
  • Chen Yingjuan
    Department of Physics Science and Technology, Hebei University
  • Li Xinzheng
    Department of Physics Science and Technology, Hebei University
  • An Wen
    Department of Physics Science and Technology, Hebei University
  • Li Xiaowei
    Department of Physics Science and Technology, Hebei University

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Photochromic microcapsule had been synthesized by the interfacial polymerization technique. Polyurea polymer shell was polycondensed between -NCO isocyanate group of IPDI and -NH2 group of TEPA. The cationic photoinitiator and fluorane dye system was encapsulated in core-shell structured microcapsule with the average size of sub-micrometer. The microcapsule was thermally stable, and showed a high optical-sensitivity to achieve color-forming reaction between the H+ proton photo-dissociated from cationic photoinitiator and the lactone ring inside the fluorane dye. Exposure for 15 s had heightened the image density from 0.1 to 0.8. By comparing the different exposing effect on photochromic image density, the color-forming reactions presented the superposition principle of exposure energy.

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