期刊
ENERGY
卷 66, 期 -, 页码 881-890出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2014.01.033
关键词
Styrene-methyl methacrylate copolymer; shell; NPCM (nano-encapsulated phase change materials); N-octadecane; Miniemulsion in-situ polymerization; TES (thermal energy storage) system
资金
- Ministry of Higher Education of Malaysia (MOHE) [FRGS/1/11/SG/UPM/01/2]
- JPA scholarship
This study deals with fabrication, physico-chemical characterizations and thermal properties of n-octadecane nanocapsules as organic PCM (phase change materials) for TES (thermal energy storage). Nano-encapsulated organic PCM was fabricated by encapsulation of n-octadecane as a core with St (styrene) - MMA (methylmethacrylate) copolymer shell using miniemulsion in-situ polymerization method. The influence of St/MMA and n-octadecane/copolymer mass ratio on the encapsulation processes, physico-chemical and thermal properties of the resulting nanocapsules has been studied systematically. DSC (differential scanning calorimeter) analysis indicated that the n-octadecane in the nanocapsules form melts at 29.5 degrees C and crystallize at 24.6 degrees C. N-octadecane nanocapsules has an enthalpy of 107.9 and 104.9 Jg-1 for melting and crystallization, respectively. TGA (thermal gravimetric analysis) thermograms showed that the nano-encapsulated organic PCM degraded in two distinguishable steps and has a good chemical stability. The thermal cycling test of the nanocapsules was carried out for 360 heating/cooling cycles and indicates that the developed nanomaterial has good chemical stability and thermal reliability. Based on all the results obtained, it can be concluded that n-octadecane/St-MMA nanocapsules have potential for thermal energy storage for buildings and other applications. (c) 2014 Elsevier Ltd. All rights reserved.
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