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Citation: YE Yu-Hua, LIU Cheng-Chen, DOU Tao. Preparation and Characterization of Impermeable Microcapsule for Thermal Energy Storage by Phase Change[J]. Chinese Journal of Applied Chemistry, ;2007, 24(11): 1318-1321. shu

Preparation and Characterization of Impermeable Microcapsule for Thermal Energy Storage by Phase Change

YE Yu-Hua ^a,, ,
LIU Cheng-Chen ^b ,
DOU Tao ^a,c

1.
a Research Institute of Fine Chemicals, Taiyuan University of Technology, Taiyuan 030024;
2.
b College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan;
3.
c Beijing Ju Long Bo Fang Research Institute, Beijing

Corresponding author: YE Yu-Hua,
Received Date: 29 November 2006
Available Online: 6 March 2007

Styrene-divinyl benzene copolymer and polyurea resin were used to encapsulate a phase change material by free radical polymerization and interfacial polymerization. The shell structure and the thermal properties of the microcapsule were investigated using fourier transform infrared spectroscopy(FT-IR), differential scanning calorimetry(DSC) and themogravimetry(TG). The encapsulation efficiency was intestigated by means of solvent drip washing. The influence of different parameters such as the amount of monomer, core-to-coating ratio and the content of emulsifier on the encapsulation efficiency was investigated. The experiment results showed that the microcapsule was a kind of composite phase change material, which was compact and impermeable. When the core-to-coating ratio was 3.2(mass ratio), the emulsifier content 2%(mass ratio), the amount of styrene-divinyl benzene 6.0%, the encapsulation efficiency was up to 81.14%. The microcapsule can withstand a high temperature up to 150℃. The melt point of the phase change material was not changed and the heat associacted with the phase transition was up to 80 J/g. The energy capacity depended upon the core-to-coating ratio, and the greater the core-to-coating ratio the higher the heat capacity. It can be used to store energy.
- phase change material,
- thermal energy storage,
- microcapsule,
- interfacial polymerization,
- free radical polymerization
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