Scientific Reports (Aug 2021)

Poplar-based thermochromic composites that change colour at 38 °C to 46 °C

  • Weihua Zou,
  • Zimu Li,
  • Zhangheng Wang,
  • Delin Sun,
  • Pingfang Zhang

DOI
https://doi.org/10.1038/s41598-021-95274-2
Journal volume & issue
Vol. 11, no. 1
pp. 1 – 9

Abstract

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Abstract The red thermochromic dye (R-TD) is the tetradecanoic acid tetradecyl ester (C28H56O2) and methyl red (C15H15N3O2) mixture that has better permeability enabling its infiltration into wood and better thermochromic properties changing its colour at above 30 °C after about 0.5 min. Thicker poplar-based thermochromic composite specimens (R-PTC, thickness: 5.0 mm) were prepared by filling the R-TD into pre-treated poplar veneer (thickness: 5.0 mm) thus allowing better penetration after pre-treatment. After R-TD infiltration, the R-PTC samples were covered by polypropylene wax for preventing R-TD from overflowing from R-PTC under the action of phase-change temperature. This R-PTC, whose colour can change from light-red to dark-red at 38 °C to 46 °C, can recover to light-red at below 38 °C after about 14 h, and the peak of colour change is at about 42 °C. R-PTC will be suitable for materials used in thermochromic furniture that can indicate the surface temperature to potential users, thus allowing assessment of likely scalded pain when used the furniture.