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利用差示扫描量热法和低温显微技术研究辛酸、月桂酸及其二元系统的热性能,建立辛酸/月桂酸二元系统相图。实验结果表明:辛酸/月桂酸二元系统的相图较复杂,辛酸质量分数较低时发生转熔,转熔温度约为14℃,转熔点相应的辛酸质量分数为60%;辛酸质量分数较高时发生共晶,共晶熔融温度为7.44℃,相变潜热为136.43J/g,共晶点相应的辛酸质量分数为80%,该共晶熔融温度适合于空调蓄冷。辛酸/月桂酸共晶混合物经过60次、120次冻熔循环后,其共晶熔融温度、熔融热、比热未发生明显变化,具有较好的热稳定性,可用作相变蓄冷材料。
Differential scanning calorimetry and low temperature microscopy were used to study the thermal properties of octanoic acid, lauric acid and their binary systems. The phase diagram of octanoic acid / lauric acid binary system was established. The experimental results show that the phase diagram of the caprylic / lauric acid binary system is more complex, the conversion of octanoic acid occurs when the content of octanoic acid is low, the conversion temperature is about 14 ℃, and the corresponding octanoic acid content is 60% High eutectic occurred, the eutectic melting temperature of 7.44 ℃, latent heat of 136.43J / g, the corresponding eutectic point octanoate mass fraction of 80%, the eutectic melting temperature suitable for air conditioning cold storage. The eutectic / lauric acid eutectic mixture has no obvious change in eutectic melting temperature, heat of fusion and specific heat after 60 times and 120 cycles of freeze-thaw cycles. It has good thermal stability and can be used as phase-change thermal storage material.