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Citation: Zou Guang-Long, Lan Xiao-Zheng, Tan Zhi-Cheng, Sun Li-Xian, Zhang Tao. Microencapsulation of n-Hexadecane as a Phase Change Material in Polyurea[J]. Acta Physico-Chimica Sinica, ;2004, 20(01): 90-93. doi: 10.3866/PKU.WHXB20040119 shu

Microencapsulation of n-Hexadecane as a Phase Change Material in Polyurea

1.
Thermochemistry Laboratory,Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian　116023

Received Date: 11 June 2003
Available Online: 15 January 2004

For thermal energy storage application, polyurea microcapsules about 2.5 μm in diameter containing phase change material were prepared using interfacial polycondensation method. In the system droplets in microns are first formed by emulsifying an organic phase consisting of a core material (n-hexadecane) and an oil-soluble reactive monomer, toluene-2,4-diisocyanate (TDI),in an aqueous phase. By adding water-soluble reactive monomer, diamine, monomers TDI and diamine react with each other at the interface of micelles to become a shell. Ethylenediamine (EDA), 1,6-hexane diamine (HDA) and their mixture were employed as water-soluble reactive monomers. The effects of diamine type on chemical structure and thermal properties of the microcapsules were investigated by FT-IR and thermal analysis respectively. The infrared spectra indicate that polyurea microcapsules have been successfully synthesized; all the TG thermographs show microcapsules containing n-hexadecane can sustain high temperature about 300 ℃ without broken and the DSC measurements display that all samples possess a moderate heat of phase transition； thermal cyclic tests show that the encapsulated paraffin kept its energy storage capacity even after 50 cycles of operation. The results obtained from experiments show that the encapsulated n-hexadecane possesses a od potential as a thermal energy storage material.
- Phase change material;Microcapsule;Interfacial polycondensation;　n-hexadecane;Thermal energy storage;Thermal analysis
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