期刊
ENERGY
卷 70, 期 -, 页码 298-306出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2014.03.125
关键词
PCM (phase-change material); Microencapsulation; Hybrid shells; n-Octadecane; Alkoxy silanes
资金
- International Collaboration Project [2008DFA51210]
MicroPCMs (microencapsulated phase-change materials) were successfully synthesized using MPS (3-(trimethoxysilyl) propyl methacrylate) and VTMS (vinyltrimethoxysilane) as raw materials for hybrid shells, and n-octadecane as core materials. DSC (differential scanning calorimeter) results show that two types of crystals form in core materials of all MicroPCMs during crystallization. The weight ratio of MPS -VTMS, and pH values play significant roles on the performance of final product: n-Octadecane content of MicroPCMs increases from 58.7 wt.% to 76.0 wt.% and their thermal degradation temperature (2 wt.% weight loss) increases from 182.6 degrees C to 188.9 degrees C with the weight ratio of MPS-VTMS decreasing from 8:0 to 2:6 in neutral synthesis systems. However, the encapsulation of n-octadecane failed when only using VTMS as hybrid shell precursor; When the weight ratio of MPS-VTMS is fixed to 2:6, the encapsulation efficiency decreases in acidic or basic synthesis systems. The optimized final product, i.e., MicroPCMs obtained with the weight ratio of MPS-VTMS equaling to 2:6 in neutral conditions, display a best thermal properties with highest melting and crystallization latent heat of 166.74 J g(-1) and 169.35 J g(-1) and the n-octadecane content decreases only by 7.0 wt.% and 10.8 wt.% after thermal treatment and thermal cycling test, respectively. (C) 2014 Elsevier Ltd. All rights reserved.
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