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摘要
Microcapsules of phase change materials (MicorPCMs) with paraffin core and acrylic ester shell were synthesized by cationic-nonionic composite emulsifiers via in-situ polymerization. The chemical structure, surface morphology and thermal properties of the MicroPCMs were characterized by Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM), differential scanning calorimetry(DSC), thermogravimetry( TG) and laser particle analyzer. The results show that the composition of emulsifier and the formulation of the monomer in shell have great effects on the properties of the MicroPCMs. When the cationicnonionic composite emulsifiers are empolyed and the mass ratio between methyl methacrylate (MMA) and acrylic(AA) is 9:1, the MicroPCMs present smooth, spherical morphology and fine size of 0.2-0.35 mu m, providing a high latent heat of phase change of 169 J/g and a good energy storage capacity. The decomposition temperature of the MicorPCMs increase 150 degrees C in comparison with pure paraffin, which is attributed to the thermal retardation of the acrylic ester shell.
