| dc.description.abstract | In this study, the n-octadecane phase change materials microcapsules (microPCMs) were prepared by suspension polymerization by using one monomer or two monomers plus crosslinking agent as shell materials. Styrene(St), Methyl methacrylate(MMA), Butyl methacrylate(BMA), Benzyl methacrylate (BzMA) were used as monomers, respectively. Azobisisobutyronitrile(AIBN), Ethylene Glycol Dimethacrylate(EGDMA) and polyvinyl alcohol were used as initiator, crosslinking agent and stabilizer, respectively. The thermal properties and surface morphology of microcapsules were measured by differential scanning calorimetry (DSC), scanning electron microscope (SEM), thermo gravimetric analysis (TGA).
In the first experimental part, the monomers, AIBN, and EGDMA were mixed with n-octadecane, then poured into the deionized aqueous solution containing PVA stabilizer (BP-24). The suspension polymerization was occurred after the above solution homogenized by the emulsion homogenizer. The results showed that under optimal reaction conditions, the latent heat and encapsulation efficiency of microPCM prepared by using one monomer plus EGDMA as shell materials were 169.1 J/g and 133.4 ×102 J/g‧% .
In the second experimental part, two monomers plus EGDMA were used as shell material, the results showed that under optimal reaction conditions, the latent heat and encapsulation efficiency of microPCM were 163.0 J/g and 133.2 ×102 J/g‧% .
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