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Microencapsulation of n ‐Eicosane as Energy Storage Material
Author(s) -
Lan XiaoZheng,
Tan ZhiCheng,
Zou GuangLong,
Sun LiXian,
Zhang Tao
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040220502
Subject(s) - chemistry , polyurea , monomer , interfacial polymerization , gravimetric analysis , emulsion , polymer chemistry , diethylenetriamine , polymerization , chemical engineering , ethylene glycol , polymer , organic chemistry , polyurethane , engineering
For heat energy storage application, polyurea microcapsules containing phase change material, n ‐eicosane, were synthesized by using interfacial polymerization method with toluene‐2,4‐diisocyanate (TDI) and diethylenetriamine (DETA) as monomers in an emulsion system. Poly(ethylene glycol)octyl‐phenyl ether (OP), a nonionic surfactant, was the emulsifier for the system. The experimental result indicates that TDI was reacted with DETA in a mass ratio of 3 to 1. FT‐IR spectra confirm the formation of wall material, polyurea, from the two monomers, TDI and DETA. Encapsulation efficiency of n ‐eicosane is about 75%. Microcapsule of n ‐eicosane melts at a temperature close to that of n ‐eicosane, while its stored heat energy varies with core material n ‐eicosane when wall material fixed. Thermo‐gravimetric analysis shows that core material n ‐eicosane, micro‐ n ‐eicosane and wall material polyurea can withstand temperatures up to 130, 170 and 250 °C, respectively.