• Title/Summary/Keyword: photochromic

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Effect of Colloidal Silica on the Photochromic Properties of Hard Coating Films Prepared by Sol-Gel Method (Colloidal Silica가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향)

  • Shin, Yong Tak;Lee, Min Ji;Cho, Kyung Sook;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.49 no.5
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    • pp.535-540
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    • 2011

  • Organic-inorganic hybrid coating solutions were prepared starting from colloidal silica, lanthanum nitrate and ${\gamma}$-glycidoxypropyl trimethoxysilane by the sol-gel method. Also, spiropyran-doped hard coating solutions were prepared by mixing the spiropyran solution, obtained after dissolving spiropyran dye into tetrahydrofuran solvent, with the organic-inorgnic hybrid coating solutions. The spiropyran-doped hard coating solutions were applied as a thin layer to polycarbonate sheets, and their photochromic properties were investigated. The effect of amount of colloidal silica added into the coating solutions was investigated on the photochromic properties of coating films. Both decoloration rate and pencil hardness of the coating films were increased with increasing the amounts of colloidal silica.

  • https://doi.org/10.9713/kcer.2011.49.5.535 인용 PDF KSCI

Effect of Solvents on the Photochromic Properties of Spiropyran in Hard Coating Films Prepared by Sol-Gel Method (Spiropyran의 분산용매가 Sol-Gel 하드 코팅 막의 광 변색 특성에 미치는 영향)

  • Kim, Dae Hyun;Shin, Yong Tak;Lee, Ju Yeon;Hong, Wongil;Lee, Bum Suk;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.47 no.4
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    • pp.430-435
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    • 2009

  • Spiropyran-doped organic-inorganic hybrid coatings were prepared starting from glycidoxypropyl triethoxysilane and vinyltriethoxysilane by a sol-gel method. They were applied as a thin layer to polycarbonate sheets and their photochromic properties were investigated. The effect of polarity of solvents dissolving the spiropyran was investigated on the photochromic properties. The decoloration rate of the spiropyran decreased with increasing the polarity of solvents dissolving the spiropyran because the open form of the spiropyran was easily stabilized in the polar gel matrix.

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A study on the polarized spectacle lens with photochromic UV blocking function of refractive index 1.60 (굴절률 1.60 광변색성 자외선 차단기능을 갖는 편광안경렌즈 연구)

  • Han, Doo-Hee
    • Journal of Convergence for Information Technology
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    • v.8 no.1
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    • pp.147-152
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    • 2018

  • A polarizing spectacle lens having a perfect blocking of ultraviolet light and a partial blocking of blue light and having photochromic properties has been developed. It is a functional spectacle lens which can be used as a spectacle lens in the daytime, which plays a role of sunglass in a space with strong ultraviolet rays, dramatically reducing glare caused by late-night driving or reflected light. Photochromism was recovered in 0.5 second dark reaction and 3 seconds recovery time. The polarization function was about 95%. Ultraviolet rays were completely blocked and blue light was reduced by about 30%. A lens that combines photochromic and UV blocking and polarization functions is the first attempt at investigating the domestic market.

  • https://doi.org/10.22156/CS4SMB.2018.8.1.147 인용 PDF KSCI