摘要
有机固液相变材料在相态变化时能够释放或吸收大量的潜热,将其应用在建筑中能减少室内温度波动,提升室内热舒适性,降低建筑能耗。采用熔融共混法制备正癸酸(CA)/十八醇(OD)二元复合相变材料,通过理论预测法与步冷曲线法确定二元低共熔混合物最佳质量配比为m_(CA)∶mOD=85∶15。通过差示扫描量热法、蓄放热实验、热重分析、傅里叶红外光谱仪对CA/OD的热性能、循环热稳定性、耐热性及结构特征进行了分析。CA/OD低共熔混合物的熔化和凝固温度分别为27.95和25.42℃,熔化和凝固潜热分别为154.2 J/g和157.0 J/g,在300次蓄放热循环过程中热性能变化小,热循环稳定性较好,蓄热控温性能良好。热重分析表明CA/OD二元低共熔混合物在125.7℃以下没有热失重现象,耐热性能好。傅里叶变换红外光谱证实CA与OD是通过物理作用相结合,二元低共熔混合物中没有新物质产生。综合结果表明,该CA/OD二元复合相变材料适合在室温附近24~30℃区间使用,基本满足人体舒适温度范围,在日常热环境下循环耐用性强,为建筑节能材料提供了新的选择。
Organic solid-liquid phase change material can release or absorb a lot of latent heat when its phase state changes.The application of phase change materials in buildings can reduce indoor temperature fluctuations,improve indoor thermal comfort and reduce building energy consumption.Binary phase change material of capric acid(CA)and octadecanol(OD)was prepared by melting blending method.The optimal mass ratio of eutectic mixture is determined as m_(CA)∶mOD=85∶15 by theoretical prediction and step cooling curve.Thermal properties,cycle thermal stability,heat resistance and structure characteristics of CA/OD composite were analyzed by differential scanning calorimetry,heat storage and release experiment,thermogravimetric analysis and Fourier infrared spectroscopy.The melting and solidification temperatures of CA/OD eutectic mixture are 27.95 and 25.42℃,respectively,and the latent heat of melting and solidification are 154.2 and 157.0 J/g,respectively.Its thermal properties change little during 300 cycles of heat storage and release,and it has good thermal cycle stability,good heat storage and temperature control performance.Thermogravimetric analysis shows that the CA/OD binary eutectic mixture has no thermogravimetric phenomenon below 125.7℃,and has good heat resistance.Fourier infrared spectroscopy analysis shows that CA and OD are combined by physical action,and no new substances are produced in the eutectic mixture.Comprehensive analysis shows that the CA/OD binary composite phase change material is suitable for operation at 24~30℃range of room temperature,meets the comfortable temperature range of human body basically,and has strong cycling durability under the daily thermal environment,which provides a new choice for building energy-saving materials.
作者
蒋达华
杨昊天
刘景滔
徐玉珍
JIANG Dahua;YANG Haotian;LIU Jingtao;XU Yuzhen(School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《中国材料进展》
CAS
CSCD
北大核心
2023年第2期168-173,共6页
Materials China
基金
江西省自然科学基金项目(20192BAB206040)
江西省教育厅科学技术研究项目(GJJ180459)。
关键词
正癸酸
十八醇
复合材料
相变
热性能
capric acid
octadecanol
composite material
phase transition
thermal property
