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COLORIMETRIC AND THERMOCHROMIC PROPERTIES OF REVERSIBLE THERMOCHROMIC WOOD

文献类型： 外文期刊

作者： Jiang, Huichuan 1 ; Fu, Feng 2 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Danzhou, Peoples R China

2.Chinese Acad Forestry, Res Inst Wood Ind, Beijing, Peoples R China

关键词： Thermochromic wood;thermochromic properties;reversibility;colorimetric properties;color difference;color hysteresis

期刊名称：WOOD RESEARCH （ 影响因子：1.139； 五年影响因子：1.184 ）

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收录情况： SCI

摘要： To endow wood materials with a thermochromic function, an organic thermochromic agent consisting of thermochromic dye, bisphenol A (BPA) and long-chain alcohols (1-tetradecanol (TD), or 1-hexadecanol (HD)) was used as a dye to prepare reversible thermochromic wood (RTCW). The colorimetric properties, including total color difference (Delta E*(ab)), lightness index (L*), red-green index (a*), and yellow-blue index (b*), were investigated at different temperatures. The color change temperature range and color hysteresis of RTCW were also analyzed. The color difference unit of National Bureau of Standards (NBS) was used to determine the color change temperature range and the achromic (chromic) temperature. In the decolorization process, with the temperature increasing, the values of Delta E*(ab), L* and b* of the RTCW samples increased, and the values of a* decreased, but the values of Delta E*(ab), L*, a*, and b* were just opposite in the colorization process. Meanwhile, the color of the RTCW with TD or HD could repeatedly change between red and light brown (wood colore) within a color temperature range of 25-35 degrees C or 37-49 degrees C respectively, presenting a "color hysteresis" phenomenon over a heating (decolorization) and cooling (colorization) cycle. The achromic and chromic temperature of the RTCW samples with TD was 31 degrees C and 25 degrees C respectively while RTCW samples with HD was 43 degrees C and 37 degrees C.

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