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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Development of Photochromic Coatings on Polycarbonate
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Development of Photochromic Coatings on Polycarbonate

机译：聚碳酸酯上光致变色涂料的开发

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摘要

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 W~(6+) 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.
机译：制备了一种新的基于杂多金属氧酸盐（HPOM）的光致变色材料，并将其掺入有机-无机杂化粘合剂中并涂覆在聚碳酸酯（PC）基材上。杂化粘合剂是通过3-环氧丙氧基丙基三甲氧基硅烷（GPTMS）和双酚的受控水解和缩合形成通过溶胶-凝胶法测定A（BPA）。使用紫外-可见（UV-Vis）吸收光谱和颜色指数值研究了材料的光致变色行为，结果表明该膜在光化学作用下被还原以产生蓝色物质在紫外光照射下，薄膜的颜色随时间增加而变为深蓝色，并且HPOM和BPA含量增加。几种HPOM钼薄膜的光敏性比钨HPOM表现出更快的着色和更慢的漂白。提出了含BPA和PWO的GPTMS基质。紫外光照射后，OH和O = W键逐渐分解随着时间的延长，W〜（6+）逐渐降低。PC基板上的光致变色涂层在紫外线照射前后具有可逆的透射率变化，从而成为紫外线照射下的高效光保护剂。

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