Preparation and Characterization of Microencapsulated Phase Change Coating

Abstract

Microencapsulated phase change materials were achieved by solvent evaporation in this article, using polymethylmethacrylate as capsule’s shell and inorganic salt CaCl2•6H2O as capsule’s core. the effects of emulsion concentration and different ratio of core and shell to the microencapsulated phase change materials were discussed. The phase change material were added to the interior wall paints and its properties were characterized. The results showed that its enthalpy content will be different with the microcapsules and different storage time.

Preparation and Thermal Properties of Molecular-Bridged Expanded Graphite/Polyethylene Glycol Composite Phase Change Materials for Building Energy Conservation

“…Finned tubes [ 12 ], heat-conducting fillers [ 13 ], and a metal/graphite matrix [ 14 ] have been applied to enhance the thermal conductivity of organic PCMs. Meanwhile, the encapsulation approaches such as the in situ polymerization method [ 15 ], complex coacervation method [ 16 ], sol–gel method [ 17 , 18 ], and solvent extraction/evaporation method [ 19 ] were developed to fabricate form-stable PCMs (FSPCM). Among all of these performance-enhancing methods of organic PCMs, using expanded graphite (EG) as a matrix to absorb solid–liquid PCMs is an ideal way to enhance the heat transfer rate as well as prevent leakage.…”

Development of a New Modified CaCl2·6H2O Composite Phase Change Material

“…The thermal conductivity of the modified material is 3.328 W/(m • K), and the subcooling is kept within 2 • C. Calcium chloride hexahydrate can be used in room temperature control, air-conditioning, and cold storage after packaging with microcapsules and porous matrix [24]. Yu et al [25] use solvent volatilization method to wrap calcium chloride hexahydrate with polymethylmethacrylate as capsule wall material to prepare microcapsule PCM, which can be used in room wall temperature control. Some other scholars used organic materials as temperature regulators to prepare a new type of organic-inorganic CPCM [26].…”