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4 CONCLUSIONS
Reversible thermochromic and phase change dual
functional materials were prepared with the raw
materials CVL, DA, SA and CA by mixing, heating
and cooling processes. The adequate mass ratio of
CVL, (SA+DA) and CA are in the area 1: 10: 30 – 1:
10: 70. The melting and solidifying enthalpies of the
samples reached up to 208.6 J/g and 202.1 J/g
corresponding to the mass ratio of CVL, (SA+DA)
and CA 1: (6+4): 50. The phase change temperatures
of the samples (40.25°C – 47.96°C) were well
matched with the thermochromic temperatures
(39.60°C – 48.90°C). The samples have good thermal
stability in their phase change processes. The absolute
differences between the phase change temperatures
and color change temperatures of the optimum
samples were ≤1.92°C. In addition, the samples also
exhibited an excellent ultraviolet absorption property,
meaning they could be used in ultraviolet protection
aspect.
ACKNOWLEDGEMENTS
This work was supported by Fundamental Research
Funds for the Central Universities of China (NO.
2652017157), and National Undergraduate
Innovation Project of China University of
Geosciences, Beijing (NO. 201711415091,
2018AB069).
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