With the characteristics of high energy storage density, approximate constant temperature of phase change and convenient to storage or transport, the microencapsulated phase change materials (MEPCM) have wide application prospect in the fields of energy storage, transport and utilization. However, the traditional MEPCM particles use formaldehyde as the shell material, which would release harmful substances during application process. Therefore, it is necessary to develop a new type of formaldehyde-free MEPCM. A novel MEPCM particles with n-dodecanol as core material and acrylic resin copolymers as shell material using suspension polymerization under ultrasound irradiation condition were prepared in this work. The scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), thermo-gravimetric analyzer (TGA) and laser particle size analyzer (LPSA) were employed to characterize the performance of MEPCM particles. The results indicated that the MCPM particles were almost regular and had a uniform particle size. The particle sizes of MEPCM were 638.14~1478.65 nm, and the median diameter d50 was 933.91 nm which reaches nanometer scale. Two types of crystals were formed in core materials of all MEPCM particle during crystallization. The melting latent heat and the encapsulation efficiency of MEPCM reached to the maximum value of 93.31 kJ/kg and 86%, respectively. The melting temperature of MEPCM was 22.26℃, and the degree of supercooling reduced from 4.61℃ to 2.13℃. The proportion of core was 43%, it was closed to the design value of 50%. The shell material did not react with the core material. The mass reduce starting temperature of MEPCM was slightly higher than that of pure n-dodecanol, indicating that the thermal stability of the phase change material can be improved after encapsulation. In summary, the MEPCM had a good potential for energy storage and high response speed when face to temperature fluctuation.
Jinli LU Yang LI Yafang HAN Fuping QIAN
. Preparation and properties characterization of microencapsulated phase change materials using acrylic resin copolymers/n-dodecanol[J]. The Chinese Journal of Process Engineering, 2019
, 19(3)
: 617
-622
.
DOI: 10.12034/j.issn.1009-606X.218282
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