The Influence of Interfacial Tension on the Properties of Phase Change Materials Microcapsules

By : Ding Li-Ming, Pei Guang-Ling

Page No: 697-707

Abstract
Microencapsulated phase change materials (MicroPCMs) were synthesized by a core-shell like emulsion polymerization method. The influences of contact angle between continuous phase and core material, interfacial tension between shell material and continuous phase on the properties of MicroPCMs were studied. OP-10 was chosen as emulsifier, 48# paraffin was used as core material, styrene and methylacrylic acid co-polymer (PS-MAA) was used as wall material. The contact angle and interfacial tension were measured by high temperature interfacial tensiometer. The results indicated that the interfacial tension had obvious effect on the surface topography, productivity and the content of core material of MicroPCMs, but almost had no effect on the thermal stability of MicroPCMs. When the mass of OP-10 was 0.5g, the productivity of MicroPCMs was as high as 93.35%, the melting and crystallization enthalpy were -94.72J/g and 95.58J/g respectively, the average particle size was 11.85mm.

Authors :
Ding Li-Ming and Pei Guang-Ling :  School of Materials Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China.