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以聚乙二醇/氧化石墨烯(PEG/GO)定型相变材料为测试样品,采用差示扫描量热法(DSC)对其熔融、结晶性能进行了表征,研究了测试速率(即升/降温速率)对该相变材料熔融、结晶温度和热焓的影响。结果表明:随着降温速率的增加,PEG/GO相变材料的结晶温度逐渐降低;随着升温速率的增加,材料的熔融温度逐渐提升;测试速率越高,焓值越小;随着GO加入量的增加,升降温时的焓值均呈现降低的趋势;相同GO含量的PEG/GO定型相变材料,其熔融焓总是大于同等测试速率下得到的结晶焓,而且测试速率越快,差值越大;在相同测试速率下,GO的添加量基本不会对PEG/GO相变材料的熔融、结晶温度产生影响。
The melting and crystallization properties of PEG / GO phase change material were characterized by differential scanning calorimetry (DSC). The effects of testing rate (ie, Cooling rate) on the melting, crystallization temperature and enthalpy of the phase change material. The results show that the crystallization temperature of the PEG / GO phase-change material decreases with the increase of the cooling rate. The melting temperature of the PEG / GO phase-change material gradually increases with the increase of the heating rate. The higher the test rate, the smaller the enthalpy. The enthalpy decreases with the increase of temperature and enthalpy at heating and cooling. For the same GO content PEG / GO phase change material, the enthalpy of fusion is always larger than the enthalpy of crystallization at the same test rate, and the test rate is faster and the difference The larger the value is; at the same test rate, the amount of GO added will not substantially affect the melting and crystallization temperature of the PEG / GO phase-change material.