Preparation and characterization of capric-palmitic-stearic acid ternary eutectic mixture/expanded vermiculite composites as form-stabilized thermal energy storage materials

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（2）
• 页码范围: 379-386
• 页数: 8页
• 语种: 英文

摘要

In this study,a composite of form-stable phase change materials (FSPCMs) were prepared by the incorpo ration of a eutectic mixture of capric-palmitic-stearic acid (CA-PA-SA) into expanded vermiculite (EV) via vacuum impregnation.In the composites,CA-PA-SA was utilized as a thermal energy storage material,and EV served as the supporting material.X-ray diffraction and Fourier transform infrared spectroscopy results demonstrated that CA-PA-SA and EV in the composites only undergo physical combination,not a chemical reaction.Scanning electron microscopy images indicated that CA-PA-SA is sufficiently absorbed in the expanded vermiculite porous network.According to differential scanning calorimetry results,the 70 wt％ CA-PA-SA/EV sample melts at 19.3 ℃ with a latent heat of 117.6J/g and solidifies at 17.1 ℃ with a latent heat of 118.3J/g.Thermal cycling measurements indicated that FSPCMs exhibit adequate sta bility even after being subjected to 200 melting-freezing cycles.Furthermore,the thermal conductivity of the composites increased by approximately 49.58％ with the addition of 5 wt％ of Cu powder,Hence,CA-PA-SA/EV FSPCMs are effective latent heat thermal energy storage building materials.