基于长链烷基良好的相容性,选取十四醇(TD)和十八烷(OC)为原料,采用熔融共混法制备了TD-OC复合相变材料。利用步冷曲线对不同质量配比的混合相变材料进行研究分析,当TD和OC质量比为30∶70时,复合相变材料为共晶相变材料。差示扫描量热仪(DSC)测得其融化和凝固温度分别为25.5℃和23.8℃,相变潜热为236.8J/g。傅里叶红外光谱(FT-IR)测试表明两者仅为物理作用进行复合,未发生化学反应。复合共晶相变材料热重(TG)测试表明其在100℃以内几乎没有质量损失。500次冻/融循环过程表明共晶相变材料的相变温度变化不超过0.3℃,体系热稳定性良好。

Based on the good compatibility of long-chain alkyls,tetradecanol (TD) and octadecane (OC) were selected as raw materials to prepare TD-OC composite phase change materials using the melt blending method.The step-cooling curve method was used to study and analyze the composite phase change materials with different mass ratios.When the mass ratio of TD to OC was 30∶70,the composite phase change material was identified as a eutectic phase change material.Differential scanning calorimetry (DSC) was used to analyze its thermal property.Its melting temperature,solidification temperature and phase change latent heat were 25.5℃,23.8℃ and 236.8J/g,respectively.Fourier-transform infrared spectroscopy(FT-IR) confirmed that two components were combined through physical interactions without any chemical reaction.Thermogravimetric (TG) testing of the composite eutectic phase change material showed that almost no mass losses below 100℃.The testing of 500 freezing/melting cycling indicated that the phase change temperature of the eutectic phase change material varies no more than 0.3℃,demonstrating good thermal stability of the eutectic phase change material.