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Development of Photochromic Coatings on Polycarbonate

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Abstract

New photochromic materials based on heteropolyoxometallates (HPOM) incorporated into a hybrid organic-inorganic binder were prepared and coated onto polycarbonate (PC) substrates. The hybrid binder was formed through the controlled hydrolysis and condensation of 3-glycidoxypropyl-trimethoxysilane (GPTMS) and bisphenol A (BPA) by the sol–gel technique. The photochromic behavior of the materials was investigated by using ultraviolet-visible (UV-Vis) absorption spectroscopy and color index values. The results indicated that the films were reduced photochemically to yield a blue species under UV irradiation, with the film color changing to deep blue with increasing time, and HPOM and BPA content. The photosensitivity of several films with molybdenum HPOM showed faster coloration and much slower bleaching than the tungsten HPOM. A photochromic mechanism involving electron transfer between the GPTMS matrix with BPA, and PWO is proposed. After UV irradiation, the O–H and \(O{=}W\) bonds decomposed gradually and W6 + was reduced gradually with increasing time. The photochromic coatings on PC substrate showed reversible transmittance change before and after UV irradiation, making then efficient light protectors under UV irradiation.

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Authors and Affiliations

  1. Department of Chemical Engineering, Yonsei University, Seoul, 120-749, South Korea

    Duck Kun Hwang, Hyun Jong Kim, Hak Soo Han & Yong Gun Shul

Authors
  1. Duck Kun Hwang
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  2. Hyun Jong Kim
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  3. Hak Soo Han
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  4. Yong Gun Shul
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Correspondence to Duck Kun Hwang.

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Hwang, D.K., Kim, H.J., Han, H.S. et al. Development of Photochromic Coatings on Polycarbonate. J Sol-Gel Sci Technol 32, 137–141 (2004). https://doi.org/10.1007/s10971-004-5778-4

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  • DOI: https://doi.org/10.1007/s10971-004-5778-4

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