Microencapsulation of Alkaline Salt Hydrate Melts for Phase Change Applications by Surface Thiol‐Michael Addition Polymerization

Abstract

The microencapsulation of alkaline salt hydrates suitable as inorganic phase change materials (PCMs) via surface Michael‐type addition polymerization of thiols and acrylates is reported. The encapsulation performance depending on the resins' acrylate‐to‐thiol ratio and monomer functionality is investigated, and the best encapsulation performance is found for resin compositions with considerable acrylate excess ratios. The step‐growth nature of the reaction can be substantiated via comparative bulk polymerizations. A multistage encapsulation mechanism is proposed in order to explain the different dependencies on the acrylate to thiol ratio observed in PCM encapsulations in comparison to bulk polymerizations.magnified image

Macroencapsulation and characterization of phase change materials for latent heat thermal energy storage systems

“…Considerable work has been carried out on the microencapsulation of the low melting (50-120°C) inorganic salt hydrates and organic materials such as waxes, terpenes, and low molecular weight polymers [23][24][25][26][27]6]. Compared to macroencapsulation, the microencapsulation of PCMs provides faster charging and discharging rates because of the smaller distance for heat transfer.…”

Solvothermal method as a green chemistry solution for micro-encapsulation of phase change materials for high temperature thermal energy storage

“…Macro (>1 mm) and micro-encapsulation properties (particle sizes of mm or nm) have been successfully developed and patented for low temperature of PCMs (organic and inorganic materials) using mainly polymeric coatings [30][31][32][33][34][35]. In some literature papers and even pilot TES installations, macro-encapsulation of inorganic salts was used.…”

A simple sonochemical method for fabricating poly(methyl methacrylate)/stearic acid phase change energy storage nanocapsules

“…The encapsulation technique depends on the physical and chemical properties of the materials used. To date, there are several physical and chemical methods used for the production of nano or micro capsules [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, the common problem with these methods is that they all require a complex or time-consuming preparation process.…”