Microencapsulation of a eutectic PCM using in situ polymerization technique for thermal energy storage

Abstract

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.

Study on Phase Change Material in Grooved Bricks for Energy Efficiency of the Buildings

“…DSC runs were carried out at a heating of 5 °C/min under constant stream of Argon atmosphere. The sample weight for PCM is approximately 2.5-10 mg [41] . The melting point temperature of PCM corresponds to the initial temperature obtained by drawing a line on the highest slope point of the upper edge.…”

Fabrication and experimental investigation of microencapsulated eutectic phase change material‐integrated polyurethane sandwich tin panel composite for thermal energy storage in buildings

“…The LA-PA eutectic mixture has been prepared by following the method of Schroder. 27,56 The eutectic mixture was a combination of 77 wt% of LA PCM and 23 wt% of PA PCM. The eutectic mixture was prepared by mixing the molten LA PCM with PA PCM for 45 minutes at 70 C. The eutectic mixture was then allowed to cool to room temperature before being tested for phase change properties.…”

“…These facile use characteristics of these materials have attracted interest from numerous sectors, such as solar energy, 16,17 energy-saving building, 18,19 thermoregulated textiles, 20 thermal storage, 21,22 and cold energy storage. 23 The polymeric shell materials comprise polymethyl methacrylate, 13 polystyrene, 24 ureaformaldehyde, 25 melamine-formaldehyde, 26,27 and biodegradable polymers such as Gum Arabic, 28 and so on. MF polymer shell is used in several research studies because of its thermochemical stability.…”