Abstract: This work aimed to solve the problem of mismatch between energy supply and demand in time, place and strength, as well as the shortages of single phase change materials. Composite phase change microcapsules (MPCMs) with LA-MA-PA-SA quaternary eutectic fatty acid as core material and melamine modified phenolic resin as shell material were prepared by in-situ polymerization. The MPCMs were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), Fourier transformed infrared spectroscopy (FT-IR) and thermogravimetric analysis (TG). The results showed that when the value of pH was between 8 and 9, the emulsifier was Span 60∶Tween 60=3∶7(mass ratio), the stirring speed in the process of encapsulation was 600 r/min, the core/shell mass ratio was 1.37∶1, the best MPCMs were obtained with smooth surface, uniform particle size distribution, higher covering rate, the phase change temperature and melting latent heat of 32.93 ℃ and 87.67 J/g respectively. There was only simple physical chimeric between core material and shell material of the MPCMs. After 50 times of cold and hot cycling, MPCMs had good heat storage thermal performance and good thermal stability.
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2020, Vol. 34 
