The study of microcapasules encapsulated eutectic energy storage material

• Main Authors: Tung Hung Chou, 周東鴻
• Other Authors: Chih Pong Chang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/08619585402121737247

碩士 === 中國文化大學 === 材料科學與製造研究所 === 93 === In this study, the thermal properties of eutectic compound material which prepared by Na2HPO4．12H2O blended with various ratio of Na2SO4．10H2O were investigated. Chemical compound of salts were added for discuss the changing of melting point, the thickeners were added for improve the phase separate during liquid state. The eutectic compound materials were microencapsulated with polyurethane wall membrane by an interfacial polycondensation method. The purpose of this study was to establish a reasonable process for preparing the microcapsules encapsulated phase change materials. The testing samples of before/after microencapsulated were measured the liquid temperature, the eutectic temperature and the latent heat value by DSC. The microstructure and chemical composition of the microcapsules were characterized by SEM and FTIR. The particle size and samples weight loss were measured by Mastersizer and TGA, respectively. The results indicated that the phenomenon of eutectic was occurred at 40wt% of Na2HPO4．12H2O and the eutectic temperature was 25.1℃. The coagulating temperature could be controlled by added chemical compound of salts and the phase separate could be improved by added anion thickeners or anion mixed with cation thickeners. The crystal temperature decreased with increasing the amount of salts, but too much salt added could be caused a serious super cooling led to shorten the constant temperature time. The eutectic composition materials were completely encapsulated with polyurethane wall membrane by interfacial polycondensation method in this study.