Figure 5
From: Poplar-based thermochromic composites that change colour at 38 °C to 46 °C
(a) The colours of the R-PTC surface changed from light-red (below 38 °C) to dark-red (above 42 °C). (b) The curve of ∆Eab. (c) The colours of the R-PTC surface changed before and after ultraviolet light treatment. (d) The thermochromic mechanism of R-TD.
