正二十烷与膨胀石墨共改性三水合醋酸钠相变材料储热性能

Phase change property of sodium acetate trihydrate modified with n-Eicosane and expanded graphite

摘要: 为了克服三水合醋酸钠（CH₃COONa·3H₂O）作为相变储热材料在相变过程中存在的相分离现象，提高其热循环性能，采用简单的共混法将正二十烷（n-Eicosane）、多孔材料膨胀石墨（EG）与CH₃COONa·3H₂O复合制备了三元相变体系（n-Eicosane-EG/ CH₃COONa·3H₂O），利用XRD、SEM、DSC等方法研究了复合相变体系的结构和储热性能。结果表明，利用正二十烷的包覆作用和EG的孔限域作用，可使n-Eicosane-EG/ CH₃COONa·3H₂O的热循环性能显著提高。

Abstract: In order to overcome the drawback of phase separation in the process of phase change and improve the thermal cycling performances of sodium acetate trihydrate (CH₃COONa·3H₂O), new phase change materials composed of CH₃COONa·3H₂O, n-Eicosane and expanded graphite (EG) were prepared by a simple blending method. The structure and thermal properties of as-prepared samples were characterized by XRD, SEM and DSC techniques. The result indicates that the thermal cycling performance of n-Eisosane-EG/CH₃COONa·3H₂O is improved by the coated effect of n-Eicosane and confinement effect of EG.