Morphology, structure and thermal stability of microencapsulated phase change material with copolymer shell
Morphology, structure and thermal stability of microencapsulated phase change material with copolymer shell
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DOI：
10.1016/j.energy.2010.12.041
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发表时间：
2011-02
期刊：
影响因子：
9
通讯作者：
Wei Li;G. Song;G. Tang;Xiaodong Chu;Sude Ma;Cai-Feng Liu
中科院分区：
文献类型：
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作者：
Wei Li;G. Song;G. Tang;Xiaodong Chu;Sude Ma;Cai-Feng Liu
采用悬浮聚合法制备了一系列以正十八烷为核的微胶囊相变材料。系统研究了引发剂种类和聚合温度对微相变相变材料的影响。用扫描电子显微镜(SEM)观察了不同壳层共聚物和不同相变材料(PCM)含量的微胶囊的形态。此外，还用扫描电子显微镜对微胶囊的核壳结构和壳层厚度进行了表征。热重分析(TGA)曲线表明，不同壳层共聚物和不同PCM含量对微相变材料的热稳定性影响不大。此外，扫描电子显微镜显示，不同含量的相变相变材料在200℃热处理30min后均保持完好，而差示扫描量热仪(DSC)曲线表明，所有经热处理的相变相变材料均无热焓。上述结果表明，微相变质点的失重可能是由于正十八烷的分解气体穿透完整的壳层造成的。
A series of microencapsulated phase change materials (MicroPCMs) with n-octadecane as core were successfully fabricated by suspension-like polymerization. The influence of initiator type and polymerization temperature on MicroPCMs were investigated systemically. The morphology of these microcapsules with different copolymer shells and various phase changing material (PCM) contents were observed by scanning electron microscopy (SEM). In addition, the core-shell structure and the shell thickness of microcapsules were also characterized by SEM. Thermal gravimetric analysis (TGA) curves indicate that the effects of different copolymer shell and various PCM contents on thermal stability of MicroPCMs were insignificant. Besides, SEM micrographs show that all of the MicroPCMs with various PCM contents remained intact after heat treatment at 200 °C for 30 min, however, all of the heat-treated MicroPCMs had no enthalpy as demonstrated by differential scanning calorimetry (DSC) curves. From above results, the weight loss of MicroPCMs may be caused by the penetration of decomposed gas of n-octadecane through the intact shells.