| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Nano-graphite Enhanced Thermal Conductivity of Decanoic Acid-Tetradecyl Alcohol Composite Phase Change Material |
| WANG Bo1, ZHU Xiaoqin1, HU Jin2, CHANG Jinghua1, CHEN Yang1, SHI Jie1
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1 Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500
2 Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650500 |
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Abstract As a common organic phase change material, fatty acids show advantages of cyclic melting/crystallization stable thermal properties, non-to-xicity, non-corrosiveness etc. Nevertheless, the low thermal conductivity coefficient of fatty acid systems (0.1—0.3 W·m-1·K-1) blocks their widespread industrial applications. For the sake of improving the thermal conductivity of decanoic acid (CA)-tetradecyl alcohol (TA) composite phase change material, composite phase change material matrix with CA and TA molar ratio of 7∶3 was selected, and nano-graphite with diverse mass fractions was added to prepare decanoic acid-tetradecyl/nano-graphite composite phase change material system. It was discovered that, a relatively stable suspension could be achieved when the added mass fraction of nano-graphite was 0.1%—0.9%. SEM, DSC and Hot Disk were employed to characterize the main thermophysical properties of the obtained composite phase change material. As can be seen from the analysis results, decanoic acid-tetradecyl/nano-graphite composite phase change material showed a substantial increase of the thermal conductivity coefficient while its phase change temperatures and latent heats maintained almost unchanged compared to the matrix. The decanoic acid-tetradecyl alcohol/nano-graphite composite phase change material with nano-graphite mass fraction of 0.6% presented optimal comprehensive property, showing 39.5% and 35.2% increase in its thermal conductivity coefficients of solid and liquid states, and its phase change tempera-ture and latent heat were 20.42 ℃ and 154.25 kJ/kg, respectively, indicating a satisfactory thermal stability.
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Published: 16 September 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51066001). |
About author:: Bo Wang, a postgraduate student in faculty of chemical engineering, Kunming University of Science and Technology, is mainly engaged in the research of phase change material preparation, energy technology and engineering.
Xiaoqin Zhu, a professor in faculty of chemical engineering, Kunming University of Science and Technology, received his Ph.D. degree in materials, participates in the research of waste residues utilization, energy technology and engineering. His research interests are applications in the area of architectural energy-saving used by waste residues and phase change materials. |
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2019, Vol. 33 
