采用熔融共混法制备了肉豆蔻酸(MA)-硬脂酸(SA)二元复合相变材料。通过Schroeder公式推导,计算出MA-SA二元共混体系的理论相变温度为48.15℃。通过步冷实验确定复合相变材料中MA与SA最佳质量比为76∶24。采用差示扫描量热仪、傅里叶变换红外光谱仪、X射线衍射仪、热重分析仪对复合相变材料的相变性能、化学结构、晶体结构、热稳定性进行表征,并测试了其蓄放热性能。结果表明:MA-SA复合相变材料的实际相变温度为46.07℃,与理论相变温度仅有4.32%的微小偏差,其相变潜热高达185.85J/g;MA与SA的复合属于纯物理混合,未发生化学反应;MA-SA复合相变材料在140.97℃以内的温度区间未出现热分解现象;经过500次冷热循环后,MA-SA复合相变材料的相变温度和相变潜热的最大偏差分别控制在1%和7.2%以内,充分证明其具备出色的热稳定性。MA-SA复合相变材料不仅相变温度适宜、相变潜热高,而且兼具优良的热可靠性和稳定性,在蓄电池热管理领域拥有广阔的应用前景。
A binary composite phase change material (PCM) of myristic acid (MA) and stearic acid (SA) was prepared using the melt blending method.The theoretical phase transition temperature of the MA-SA binary blend system was calculated to be 48.15℃ through the derivation of the Schroeder formula.Stepwise cooling experiments determined the optimal mass ratio of MA to SA in the composite PCM to be 76∶24.The phase transition performance,chemical structure,crystal structure,and thermal stability of the composite PCM were characterized using differential scanning calorimetry (DSC),Fourier transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD),and thermogravimetric analysis (TGA),along with tests on its heat absorption and release properties.The results showed that the actual phase change temperature of the MA-SA composite PCM was 46.07℃,with only a minor deviation of 4.32% from the theoretical value.Its latent heat of phase change reached as high as 185.85J/g.The combination of MA and SA was purely physical mixing without any chemical reaction.The MA-SA composite PCM exhibited no thermal decomposition within the temperature range below 140.97℃.After 500 thermal cycles,the maximum deviations in phase change temperature and latent heat of the MA-SA composite PCM were controlled within 1% and 7.2%,respectively,demonstrating its excellent thermal stability.The MA-SA composite PCM not only featured a suitable phase change temperature and high latent heat but also possessed superior thermal reliability and stability,making it highly promising for applications in battery thermal management.
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