Figure - available from: European Journal of Wood and Wood Products
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a SEM image of radial direction from OP specimen. b SEM image of radial direction from TP specimen. c, e SEM images of longitudinal direction from OP specimen. d, f SEM images of longitudinal direction from TP specimen
Source publication
Thermochromic poplar specimens were prepared by directly filling the thermochromic dye into poplar samples. After thermochromic dye infiltration, the thermochromic poplar samples were covered by polypropylene wax for preventing thermochromic dye overflowing from thermochromic poplar under the action of phase-change temperature. This thermochromic d...
Citations
... Plantation poplar is widely planted in many countries; itis a kind of farmed green material [21][22][23]. We used the longitudinal-cutting plantation poplar wood as the matrix material in this work as it is a good substitute for the natural forest woods. ...
... Ningbo, China) was used to test their surface temperatures after OP and TESPs were heat-treated at 60 • C for 30 min, and each temperature was measured at 5 min intervals. The weights of TESPs before and after heat treatment at 103 • C for 150 h were compared to test the heat resistances of TESP with or without the SiO 2 film [23,24]. ...
... The FT-IR spectra of PCMs: The strong signals at 1450 cm −1 , 2850 cm −1 and 2900 cm −1 all correspond C-H groups of dimethyl and trimethyl in PCMs (PCM-1, lauryl alcohol, C 12 H 26 O; PCM-2, decanoic acid, C 10 H 20 O 2 ; and PCM-3, myristic acid myristyl ester, C 28 H 56 O 2 ), respectively [22][23][24][25]. ...
Using thermal energy storage wood with phase change materials (PCM) as a building material can save thermal energy during heat-induced phase transition, and can reduce the energy consumption of indoor heating. In our work, three thermal energy storage poplars (TESPs: TESP-1, TESP-2 and TESP-3) were prepared by directly infiltrating three PCMs (fatty alcohol/acid materials: lauryl alcohol, decanoic acid and myristic acid myristyl ester), respectively, into the longitudinal-cutting plantation poplar woods and by directly encapsulating the PCMs in the poplar-based materials with SiO2 films. The phase-changing temperature ranges of TESP-1, TESP-2 and TESP-3 were at 19–30 °C, 26–39 °C and 33–54 °C, respectively. The phase-changing temperature peaks were at ~24 °C, ~31 °C and ~42 °C, respectively. After the same heat treatment on TESPs and original poplar (OP), the average temperature of TESPs was higher than that of OP after 35 min, thus proving that TESPs can save more thermal energy than OP. The radial bending strengths of TESP-1, TESP-2 and TESP-3 had increased by 50.85%, 70.16% and 70.31%, respectively, as compared to with that of OP. Additionally, the radial bending elastic modules of TESP-1, TESP-2 and TESP-3 had increased by 47.14%, 67.38% and 74.57%, respectively, as compared to OP. The tangential section hardness of the TESPs also had also increased by 67.09%, 71.80% and 80.77%, respectively. These improved mechanical properties of TESPs are almost close to that of ash wood (ash wood is a common building material), therefore, this proves that our TESPs can be used as thermal energy-saving building materials.
A blue thermochromic dye (B-TD) was prepared by mixing crystal violet lactone (CVL), hydroxyethyl acrylate (HEA) and myristic acid myristyl ester (MME). B-TD is a phase-changing material and can change colour at above 32°C about 5 s. The B-TD can permeate into pre-treated pinewood samples about 8–10 mm from the surface of samples after immersed pre-treated pinewood samples in B-TD for about 10 min at 70 °C. A blue thermochromic pinewood (B-TP) was prepared by filled the B-TD into pre-treated pinewood and covered polypropylene wax that can prevent B-TD overflowing from wood-based material when at phase-changing temperature. The B-TP can change colour from dark blue to light blue at 38–48°C, and can recover dark blue at below 38°C after about 5 h. B-TP can be used in a kind of pinewood woodwork that can indicate the temperature of woodwork surface to users by its colour-change phenomenon at 38–48°C, covering the lowest temperature of cryogenic burns (42°C), so this kind of pinewood woodwork can warn the temperature of cryogenic burns for avoiding cryogenic burns by its colour-change phenomenon.
