长链烷基共晶相变材料的制备及性能
Preparation and properties of long chain alkyl eutectic phase change materials
吴亚楠 1王璇 1唐炳涛 1张宇昂1
作者信息
- 1. 大连理工大学 精细化工国家重点实验室,辽宁 大连 116024
- 折叠
摘要
基于长链烷基良好的相容性特点,以二十烷(ES)、十八烷(OC)、月桂酸(LA)和十六醇(HD)为原料,通过熔融共混法制备了 ES-LA、OC-LA 和 OC-LA-HD 共晶相变材料.通过施罗德公式预测理论共晶点的组成及相变温度,结合步冷曲线与DSC结果,共同确定共晶点最佳质量比分别为m(ES)∶m(LA)=0.61∶0.39、m(OC)∶m(LA)=0.74∶0.26和m(OC)∶m(LA)∶m(HD)=0.61∶0.21∶0.18,共晶温度分别为30.3、25.4、21.9℃,与理论计算结果吻合.采用FTIR、XRD、TGA及DSC对共晶相变材料的化学结构、结晶行为、热稳定性和储热能力进行了表征.结果表明,3 种共晶相变材料通过物理作用进行复合,无化学反应发生.其相变温度均在18～32℃之间,且低于其任意单一组分,相变焓值均>190 J/g,具有良好的热稳定性和循环稳定性.
Abstract
Based on the good compatibility of long-chain alkyl groups,with eicosane(ES),octadecane(OC),lauric acid(LA)and hexadecanol(HD)as raw materials,three eutectic phase change materials(ES-LA,OC-LA and OC-LA-HD)were prepared by melt blending method.The optimum mass ratio of eutectic points was calculated by Schröder formula,and was determined as m(ES)∶m(LA)=0.61∶0.39,m(OC)∶m(LA)=0.74∶0.26 and m(OC)∶m(LA)∶m(HD)=0.61∶0.21∶0.18,combing the results of step-cooling curve and DSC analysis.The eutectic temperatures were 30.3,25.4,21.9℃,respectively,which were consistent with the theoretical calculation results.The chemical structure,crystallization behavior,heat storage capacity,and thermal stability of eutectic phase change materials were evaluated and analyzed by FTIR,XRD,TGA and DSC.The results showed that three eutectic phase change materials were combined by physical interaction without chemical reaction.The phase transition temperatures were between 18～32℃,lower than any single component,while the phase transition enthalpy values were>190 J/g,indicating good thermal stability and cycle stability.
关键词
烷烃/脂肪酸/脂肪醇/共晶相变/复合材料/热能存储/建筑用化学品Key words
alkanes/fatty acids/fatty alcohols/eutectic phase change/composites/thermal energy storage/building chemicals引用本文复制引用
基金项目
国家重点研发计划项目(2022YFB3806500)
国家自然科学基金项目(22108026)
国家自然科学基金项目(22108050)
出版年
2024
NETL
NSTL
万方数据