Abstract: An organic/inorganic composite phase change material with high latent heat to be employed in the temperature range of -1~-3℃ was developed. The main base solution of the composite phase change material was determined to be mannitol aqueous solution after 10 repeated experiments. The supercooling degree and cooling rate of the phase change material was studied adding nucleating agent,namely,potassium sulfate,sodium acetate and sodium hexametaphosphate,and the thickener polyacrylic acid sodium(PAAS),and the thermal cyclic experiment was conducted. The results showed that the 3% mannitol aqueous solution had the least average supercooling of 3% with the latent heat of 319.5J/g. 0.5% potassium sulfate,1% sodium acetate and 1% sodium hexametaphosphate could completely eliminate the supercooling of mannitol aqueous solution. The effect of sodium hexametaphosphate on the latent heat of phase change was the least using the above materials,which the latent heat only decreased by 4.3%. The length of the phase change platform of composite phase change material increased by 60% with the increases of polyacrylic acid sodium from 0 to 0.4%,and the length of the platform decreased by 25% with the increases of PAAS from 0.4% to 1%. It was found from the cyclic experiment that the composite phase change material hasd good thermal reliability.

Key words: composites, phase change, thermodynamic properties, stability

摘要： 研制了一种应用于-1~-3℃、具有高相变潜热值的有机无机复合相变材料。通过10次重复实验筛选出复合相变材料主基液（3%甘露醇水溶液，质量分数，余同），在基液中添加成核剂硫酸钾（K₂SO₄）、乙酸钠（CH₃COONa）和六偏磷酸钠[（NaPO₃）₆]及增稠剂聚丙烯酸钠（PAAS）研究其对相变材料过冷度、相变平台和放冷速率的影响，并进行热循环实验。实验结果表明，3%甘露醇水溶液平均过冷度最小，相变潜热为319.5J/g；0.5% K₂SO₄、1% CH₃COONa和1%（NaPO₃）₆可以完全消除甘露醇水溶液的过冷度，（NaPO₃）₆对相变潜热影响最小，仅降低4.3%；PAAS质量分数从0增加至0.4%，材料相变平台延长了60%，从0.4%增加至1%，相变平台缩短了25%；通过50次和100次的循环实验，发现该复合相变材料热稳定性良好。

关键词: 复合材料, 相变, 热力学性质, 稳定性