摘要
以癸酸(CA)和十六醇(H)为原料,通过熔融共混法制备了二元脂肪酸醇复合相变材料,并利用步冷曲线法确定癸酸-十六醇(CA-H)二元复合相变材料的最佳质量配比为74∶26,共晶温度为24.5℃,过冷度为0.2℃。采用傅里叶红外光谱仪(FTIR)、X射线衍射仪(XRD)、蓄放热实验和冷热加速循环实验等研究了CA-H复合相变材料的结构与性能,发现CA-H的FTIR曲线上同时存在CA和H的特征吸收峰,CA-H的XRD图谱上存在CA和H的衍射峰,说明CA与H是通过分子力作用在一起,没有发生化学反应。然后对CA-H进行500次5~80℃冷热加速循环实验,发现其相变温度和相变潜热变化较小,可见CA-H的热循环稳定性良好,且蓄放热性能较好。同时,根据差示扫描量热仪(DSC)分析得到CA-H的相变温度为24.22℃,相变潜热为190.5J/g,这与通过步冷曲线测得的共晶温度吻合。因此,该CA-H复合相变材料适用于建筑节能、空调冷凝热回收及低温太阳能热储存等领域。
The binary organic composite phase change material was prepared by melt blending method with capric acid(CA)and hexadecanol(H)as raw material.The optimum mass ratio of capric acidhexadecanol(CA-H)binary composite phase change material equated to 74∶26,eutectic temperature and super-cooling degree up to 24.5℃and 0.2℃was determined with cooling curve method.The structure and properties of CA-H composite phase change materials were characterized by fourier transform infrared spectrometer(FTIR),X ray diffractometer(XRD),heat storage and exothermic experiments and accelerated thermal cycling experiments.It was found that the characteristic absorption peaks of CA and H coexisted in FTIR curve of CA-H,and the diffraction peaks of CA and H coexisted in XRD spectra of CA-H,indicating that CA and H were combined by molecular forces without chemical reaction.After 500 thermal cycles between 5℃and 80℃,the change of the phase transition temperature and latent heat were not significant.It showed that CA-H had better thermal stability,and heat storage and release performance were good.According to the differential scanning calorimeter(DSC),the phase change temperature and the corresponding latent heat of CA-H were 24.22℃and 190.5J/g respectively,which was consistent with the eutectic temperature measured by cooling curve.Therefore,the CA-H composite phase change material was suitable for building energy conservation,condensation heat recovery of air conditioning and low temperature solar energy heat storage.
作者
顾庆军
费华
王林雅
方敏
蒋达华
赵运超
GU Qingjun;FEI Hua;WANG Linya;FANG Min;JIANG Dahua;ZHAO Yunchao(School of Architectural and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2019年第11期5033-5039,共7页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51666004,51966004)
江西省自然科学基金(20171BAB206041)
江西理工大学清江青年优秀人才项目(JXUSTQJYX2017003)
关键词
复合材料
相变
二元混合物
癸酸
十六醇
composites
phase change
binary mixture
capric acid
hexadecanol
