以石蜡(PC)、癸酸(CA)、月桂酸(LA)、肉豆蔻酸(MA)、棕榈酸(PA)、硬脂酸(SA)为相变材料,采用熔融共混法制备了5组石蜡-脂肪酸二元低共熔混合物,利用步冷曲线法验证了PC-CA和PC-LA相变温度符合建筑节能领域的温度范围要求。采用差示扫描量热仪、傅里叶变换红外光谱仪、热重分析仪等研究了石蜡-脂肪酸二元低共熔混合物的热物性、结构稳定性和热稳定性等相变性能。结果表明:理论估算的PC-CA、PC-LA、PC-MA、PC-PA、PC-SA的相变温度分别为27.79℃、34.16℃、39.26℃、42.42℃、45.51℃;差示扫描量热法测试的相变温度分别为27.97℃、36.68℃、43.53℃、45.50℃、47.45℃,两者误差值较小说明理论估算法对于预测相变温度具有较高的可靠性。石蜡与脂肪酸之间仅为物理结合,无新物质产生;石蜡-脂肪酸二元低共熔混合物在150℃以下未发生分解,能够保持稳定的工作性能。
Paraffin (PC),decanoic acid (CA),lauric acid (LA),myristic acid (MA),palmitic acid (PA) and stearic acid (SA) were used as phase change materials to prepare five groups of binary low eutectic mixtures by melt blending method.The step cooling curve method results verified that the phase transition temperature of PC-CA and PC-LA met the temperature range requirements for building energy saving field.Differential scanning calorimeter (DSC),Fourier transform infrared spectrometer (FT-IR) and thermogravimetric analysis (TG) were used to study the thermal properties,structural stability and thermal stability of the composites.The results showed that the theoretically estimated transformation temperatures of PC-CA,PC-LA,PC-MA,PC-PA and PA-SA were 27.79℃,34.16℃,39.26℃,42.42℃ and 45.51℃,respectively.The DSC-measured phase change temperatures were 27.97℃,36.68℃,43.53℃,45.50℃ and 47.45℃,respectively.The small deviations between theoretical and experimental values indicated that the theoretical estimation method was highly reliable for predicting phase change temperatures.Paraffin and fatty acids were combined by physical action without the formation of new substances.There were no paraffin-fatty acid binary eutectic mixtures decomposition occurred below 150℃,maintaining stable performance.
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基金资助
2024年江苏省土木建筑学会科研课题(JSTJXH24125);江苏省高等学校基础科学(自然科学)研究重大项目(24KJA220003);江苏省高等学校自然科学研究项目(23KJA560007)
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