Preparation of polyurethane microcapsule containing mix n-alkanes and their thermal properties

• Main Authors: Cheng-Ruei Li, 李承叡
• Other Authors: Chih-pong Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/77qr7y

碩士 === 中國文化大學 === 化學工程與材料工程學系奈米材料碩士班 === 100 === This study was to investigate the oil-based polyurethane (PU) coated with eicosane (n-Eicosane) prepared by solvent evaporation method and positive dodecane (n-Docosane) mixed and coated into a phase transfer material microcapsules. Phase change material properties of the stable, but the phase change of the number of different carbon materials have a fixed phase change temperature. In order to control the suction exothermic temperature and enthalpy of quality, this study attempts to extreme temperatures (about 200 ℃, -5 ℃) does not destroy the phase transfer material, the use of different proportions of mixed modified alkanes relative to the transfer material. try changing the enthalpy of alkanes and quality of the suction temperature heat. Study using scanning electron microscopy, Fourier transform infrared spectroscopy, laser particle size analyzer, thermal gravimetric analysis, differential thermal analysis for the structural identification evidence and analysis to smooth the surface, according to the results of the analysis, the phase change microcapsulesand good formability, the average particle size of microcapsules obtained under the preparation conditions of 1000 rpm is 55.26 ± 1.31μm. By the analysis of test results, after mixing modification of alkanes, eicosane and Masaji dodecane mixing ratio of 1:4 with the best results, start endothermic temperature and initial exothermic temperature duedifferent proportion may change, add more carbon and the number of PCM (phase change materials) higher the proportion of the initial endothermic temperature and the initial exothermic temperature will favor the more carbon and the number of PCM temperature. Conversely, when you add less carbon number PCM higher the proportion of the initial endothermic temperature and the initial exothermic temperature will favor less carbon number PCM temperature, after modification, the proportion of mixed PCM have raised the quality of the effect of enthalpy to enhance from 1.9% to 10%, modified mixing ratio of 2:1 to enhance the effect of 10% has certainly achieved the desired effect. Mixture of alkanes by the PU coating, the measured PU / alkanes the microcapsule still have good suction exothermic nature of the phase change material has not been by the coating to change its original features.