Abstract
Leuco dyes are widely used as functional materials for their thermosensitive chromogenic nature. The influences of thermochromic compounds and impregnation processing conditions on thermochromic wood veneer properties were investigated in this paper. The thermochromic compounds included thermochromic dye (ODB-2), color developer (bisphenol A) and solvent (1-tetradecanol). To achieve the maximum color change, the optimum mixing ratio of ODB-2 to bisphenol A to 1-tetradecanol was 1:2:60. Juglans mandshurica veneers were ultrasonically impregnated with reversible thermochromic compound suspensions. Analysis of variance showed that the influences of impregnation parameters on veneer color change were significant at the 0.05 level. The optimum thermochromic wood veneer can be obtained by impregnating with a thermochromic compound suspension for 2.0 min at 65 °C. In this paper, the thermochromic properties of wood veneers were evaluated, and functional thermochromic veneers exhibited excellent properties and thermostability.
Highlights
Wood color plays an important role in the commercialization process[1] and is dependent on species, tree genetic resources, drying process and thermal treatments[2,3,4,5]
The orthogonal design was used to optimize thermochromic composition formula to obtain best color change, and ΔE values were calculated to describe the degree of color change
To achieve maximum ΔE values, the optimum thermochromic wood veneer can be fabricated by impregnating the wood with a suspension of thermochromic compounds for 2.0 min at 65 °C
Summary
Wood color plays an important role in the commercialization process[1] and is dependent on species, tree genetic resources, drying process and thermal treatments[2,3,4,5]. Color changing features can enrich the decorative effect of wood materials and can be used as temperature indicators. Reversible thermochromic composites, consisting of leuco dye, color developer and organic solvent, are characterized by coloration in the solid state and discoloration in the molten state[11]. Liu et al colored poplar veneer by ultrasonic impregnation using crystal violet lactone, biphenyl A, 1-tetradecanol and sodium thiosulfate. Previous studies showed that the interaction between solvent, developer and ODB leuco dyes had significant effects on reversible thermochromic performances[21,22]. Thermochromic compounds consisting of ODB-2 dye, bisphenol-A developer and 1-tetradecanol organic solvent were used for veneer impregnation. The effects of synthesis conditions on the thermochromic properties of wood veneers were studied. Test Mixing ratio of ODB-2 and bisphenol Interaction Mixing ratio of ODB-2 and 1-tetradecanol Null ΔE
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