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Summary In the present work, microencapsulated phase change material (M‐PCM) has been synthesized with eutectic mixture (75% SA + 25% CA) as core and melamine formaldehyde (MF) as shell using in situ polymerization. Advanced instrumental techniques like field emission scanning electron microscopy (FE‐SEM), Fourier‐transform infrared spectroscopy (FT‐IR), particle size analyzer (PSA), thermogravimetric/differential thermal analysis (TG/DTA), differential scanning calorimetry (DSC), and thermal conductivity analyzer (TCi) were used to characterize the synthesized M‐PCM, and impact of effective parameters like pH and agitator speed on the encapsulation process was also elucidated. Results obtained reveal that at the optimized pH (3.2) and agitator speed (1500 rpm) M‐PCM possess smooth surface morphology, spherical in shape with particle size of 10.41 μm. Based on FT‐IR analysis, it was observed that the synthesized M‐PCM was uniformly encapsulated by MF resin with eutectic mixture in the core. The encapsulation process results in the improvement of the thermal stability of eutectic mixture, it increases from 202.5 to 212.3°C, and the encapsulation efficiency of the M‐PCM is found to be 85.3%. The melting point and latent heat of fusion of M‐PCM were found to be 34.5°C and 103.9 kJ/kg, respectively.

Microencapsulation of binary mixture of 75% stearic acid (SA) + 25% capric acid (CA) (as core) has been amalgamated by silica (as shell) through sol-gel method. The obtained silica binary mixture (Si-BM) microcapsules was characterized in detail by sophisticated instruments such as field emission scanning electron microscope (FESEM), Fourier transformation infrared spectroscopy (FTIR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC), and thermogravimetric (TG/DTA) were exploited to identify shape and mean size, functional groups, nature of crystallinity, and weight loss of Si-BM. The obtained microcapsules were regular in shape, crystalline state, mean size about 6.03 μm and the encapsulation efficiency of Si-BM found to be 71%. The dissimilar microcapsules such as Si-BM and melamine formaldehyde phase change material (MF-PCM) were assimilated (1, 3, and 5 wt%) into cement paste to elucidate thermal-mechanical properties. As the amount of Si-BM increases, the compressive strength increased by 10% and thermal conductivity of cement paste is increased by 9% as compared to MF-PCM. Novelty StatementEncapsulation of binary mixture is synthesized with silica through chemical method. The nonidentical different dosage of microcapsules such as MF-PCM and Si-BM were incorporated into pure cement system to determine its effect on mechanical and thermal properties of cementitious system. These data will be useful to further incorporation in mortar and concrete for energy storage as well as thermal load reduction on buildings.