Macromolecular Research, Vol.23, No.11, 1004-1011, November, 2015
Synthesis of monodispersed paraffin microcapsules by polycondensation using membrane emulsification and their latent heat properties
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Microencapsulation technique of phase change materials (PCMs) has been attracted as one of effective methods to store and transfer the energy. Although the size control of microcapsules as PCMs is very important, it still remains a key issue to resolve. In this study, monodispersed paraffin microcapsules with silica shell were fabricated by membrane emulsification and thermal properties were investigated for the application of energy saving wallpaper. Particle size analyzer, scanning electron microscopy, Fourier transform infrared spectroscopy, and differential scanning calorimetry were used for microcapsule characterization. As results, uniform size of paraffin microcapsules (mean diameter 5 μm) was obtained at high N2 pressure and low surfactant concentration using membrane emulsification and silica shell was successfully synthesized by polycondensation. Also, their latent heat properties were significantly improved compared to pure paraffin. Finally, membrane emulsification is very effective technique to fabricate paraffin microcapsules with feasible size control. Since paraffin microcapsules have high latent heat with thermal stability, those can be used for the application of functional wallpaper as well as building structure materials for saving energy.
Keywords:paraffin microcapsule;silica;membrane emulsification;phase change materials;energy saving wallpaper
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