Preparation and Characterization of Phase Change Materials Microcapsules for Thermal Energy Storage
Volume Title: 1
Department of Polymer Engineering and Color Technology, Amirkabir University of Technology
The main purpose of this research is preparing microencapsulated phase change materials (MEPCM) by using a UV-curable pickering emulsion polymerization with PMMA-graphene oxide hybrid shell. Phase change materials (PCMs) with high latent heat are used in thermal energy storage (TES) which is an efficient and sustainable way for storing energy. Bio-based PCMs are less flammable than paraffins and can absorb, store and release large amounts of latent heat. Therefore, coconut oil which is a bio-based PCM was used as the core in this project. The emulsion was stabilized by graphene oxide (GO), in which GO was absorbed spontaneously on the surface of methyl methacrylate to produce hybrid shell. The polymerization process was carried out at ambient temperature for 30 minutes by utilizing LED as a source of ultraviolet radiation. The effect of agitation speed (i.e. 900 and 1200 rpm) on particle size and core content of microcapsules were investigated by optical microscopy (OM) and differential scanning calorimetry (DSC). In addition, the thickness of shell for two conditions was calculated. According to OM results, microcapsules produced at 900 and 1200 rpm conditions had a mean size of 28 and 12 µm, respectively. In addition, the core content of the samples was found to be 55.37% and 56.25%.