【摘要】 以石蜡为芯材，聚砜为壳材，纳米石墨为改性剂，采用溶剂挥发法制备了纳米石墨改性石蜡相变微胶囊。通过SEM、FT-IR、DSC、TGA等对相变微胶囊进行表征，研究添加不同剂量纳米石墨对相变微胶囊的表面形貌、化学结构、相变特性、热稳定性以及包裹率的影响。结果表明，当纳米石墨添加量为1.5%时，微胶囊的整体性能最好，平均粒径为326.6μm,熔化温度和熔化焓为29.87℃和94.00 J/g,结晶温度和结晶焓为23.61℃和92.95 J/g,微胶囊的包裹率为61.46%,具有良好的热稳定性。更多还原

【Abstract】 Nano-graphite modified paraffin phase change microcapsules(NGPCM) are prepared by solvent evaporation method with paraffin as core material, polysulfone as shell material and nano-graphite as modifier. The PCMs are characterized by SEM, FT-IR, DSC, and TGA to study the effects of different doses of nanographite on the chemical structure, phase change characteristics, surface morphology, thermal stability, and encapsulation rate of PCMs. The results show that when the addition amount of nano-graphite is 1.5%, the overall performance of the microcapsules is the best. The average particle size of the microcapsules is 326.6 μm, the melting temperature and melting enthalpy are 29.87 ℃ and 94.00 J/g, the crystallization temperature and crystallization enthalpy are 23.61 ℃ and 92.95 J/g, and the encapsulation rate of the microcapsules is 61.46%, showing good thermal stability.更多还原