Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28777
Title: Structure and thermal stability of microencapsulated phase-change materials
Authors: Zhang, XX
Tao, XM 
Yick, KL 
Wang, XC
Keywords: In-situ polymerization
Microcapsule
n-octadecane
Thermal stability
Issue Date: 2004
Source: Colloid and polymer science, 2004, v. 282, no. 4, p. 330-336 How to cite?
Journal: Colloid and Polymer Science 
Abstract: A series of microcapsules containing n-octadecane with a urea-melamine-formaldehyde copolymer shell were synthesized by insitu polymerization. The surface morphology, diameter, melting and crystallization properties, and thermal stability of the microcapsules were investigated by using FTIR, SEM, DSC, TGA and DTA. The diameters of the microcapsules are in the range of 0.2-5.6 μ. The n-octadecane contents in the microcapsules are in the range of 65-78wt%. The mole ratio of urea-melamine has been found to have no effect on the melting temperature of the microcapsules. Two crystallization peaks on the DSC cooling curve have been observed. The thermal damage mechanisms are the liquefied n-octadecane leaking from the microcapsule and breakage of the shell due to the mismatch of thermal expansion of the core and shell materials at high temperatures. The thermal stability of materials can be enhanced up to 10 °C by the copolymerization of urea, melamine and formaldehyde in a mole ratio 0.2:0.8:3. The thermal stability of 160 °C heat-treated microcapsules containing 8.8% cyclohexane can be further enhanced up to approximately 37 °C.
URI: http://hdl.handle.net/10397/28777
ISSN: 0303-402X
DOI: 10.1007/s00396-003-0925-y
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