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Citation: YANG Chang-Guang, LAN Xiao-Zheng, JI Xiang-Juan. Microencapsulation of n-Eicosane as an Energy Storage Material Synthesized by Interfacial Polymerization[J]. Chinese Journal of Applied Chemistry, ;2008, 25(10): 1209-1212. shu

Microencapsulation of n-Eicosane as an Energy Storage Material Synthesized by Interfacial Polymerization

1.
College of Chemistry and Materials Science, Shandong Agriculture University, Tai'an 271018

Corresponding author: LAN Xiao-Zheng,
Received Date: 1 September 2007
Available Online: 28 December 2007
Fund Project: 山东农业大学博士基金(23208)资助项目 (23208)

Polyurea microcapsules containing a phase change material,n-eicosane,were synthesized by means of interfacial polymerization method with toluene-2,4-diisocyanate(TDI) and 1,6-hexane diamine(HDA) as the monomers in an emulsion system.Poly(ethylene glycol) octyl-phenyl ether(OP),a nonionic surfactant,was the emulsifier for the system.TDI reacted with HDA at a mass ratio of 1.5 to 0.8.The sizes of microcapsules were analyzed with TEM and a laser particle analyzer.The hollow microcapsules were about 0.2 μm in diameter and those containing n-eicosane were about 2~6 μm in diameter.FT-IR spectra proved the formation of the wall material,polyurea,from the two monomers,TDI and HDA.Encapsulation efficiency of n-eicosane was about 65%~80%.Microcapsule of n-eicosane melted at a temperature close to that of n-eicosane,while its stored heat energy varied with the amount of n-eicosane when the wall material was fixed.Thermo-gravimetric analysis showed that core material n-eicosane,micro-n-eicosane and wall material polyurea can withstand temperatures of up to 130℃,165℃,and 250℃,respectively.
- phase change material,
- n-eicosane,
- microcapsule,
- interfacial polymerization
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