A series of poly(MMA-co-2-HEA)/n-octadecane (P(MMA-co-2HEA)/C18) and poly(MMA-co-2-HEA)/n-eicosane (P(MMA-co2HEA)/C20) microcapsules were prepared by an emulsion polymerization method as microencapsulated phase change materials (MEPCMs). The structural identification was done by using FTIR spectroscopy and thermal properties of the hydrophilic monomer imcorporated microcapsules were investigated using Differential Scanning Calorimetry (DSC) and Thermogravimetric analysis (TGA) techniques. The surface morphology and particle size of MEPCMs were studied using a Polarised Optical Microscope (POM) and a Particle Size Analysizer (PSA) respectively. DSC indicated that the microcapsules containing highest amount of the n-alkane had a latent heat of 125 J/g as and TGA technique showed about thermal stability. The particle size and distribution analysis showed that the microcapsules had uniform and narrow size distrubiton. Also it was confirmed by FTIR spectroscopy that the poly(MMA-co-2-HEA) shell was successfully synthesized as the shell of the paraffin core. Besides it was found that the thermo-physical properties were strongly dependant on the content of the microcapsules.