In order to adjust buildings temperature, a dodecanol (DD)-palmitic acid (PA)/hydroxylpropyl methyl cellulose (HPMC) composite phase change material was prepared by vacuum impregnation. DD-PA was absorbed into the HPMC, which was verified by specific surface area, pore size (BET) and scanning electron microscopy (SEM) analysis. The results of Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometer (XRD) indicated that the HPMC and DD-PA were only physical combination. The differential scanning calorimetry (DSC) analysis revealed that the phase change temperature and latent heat were 19.34 ºC and 113.12 J g−1, which means good energy storage capacity. The 5% mass loss temperatures (T-5%) of thermo-gravimetric analysis (TG) was higher than 50 ºC, showing the good thermal stability of composite phase change materials. About 60% DD-PA was absorbed in HPMC, which detected by DSC and TG. After 100 thermal cycling, the latent heat, onset temperature (T0), peak temperature (Tpeak) and end temperature (Tend) had changed −1.02%, −8.20%, −4.29% and −5.60%. The result showed that the composite phase change materials own good thermal reliability. In addition, the 2% multi-walled carbon nanotubes (MW CNTs) were added to improve the thermal conductivity. And the thermal conductivity was increased from 0.130 to 0.172 W (mK)−1, the total thermal storage-release time was decreased from 3740 to 2310 s.
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This work was financially supported by Guangdong Basic and Applied Basic Research Foundation (2020A1515011411), Key Research special Projects in Universities in Guangdong Province (2019KZDZX2002), the National Natural Science Foundation of China (31570572), and Guangzhou Science and Technology Project (201905010005) and the Project of Key Disciplines of Forestry Engineering of Bureau of Guangzhou Municipality.
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Qu, M., Guo, C. & Li, L. Preparation, characterization and thermal properties of dodecanol, palmitic acid and hydroxylpropyl methyl cellulose as novel form-stable phase change materials. J Therm Anal Calorim 147, 4915–4924 (2022). https://doi.org/10.1007/s10973-021-10915-y
- Eutectic mixture
- Thermal conductivity
- Multi-walled carbon nanotubes
- Phase change materials