The Properties of OMMT-PAN-Binary of Fatty Acids Blends as Phase Change Materials

Abstract

Using stearic acid-lauric acid binary of fatty acid as phase change material, waste polyacrylonitrile fiber (PAN) as supporting material, organic montmorillonite (OMMT) as modifier, and N, N-dimethylformamide as solvent, OMMT-PAN-binary fatty acid composite phase change materials(PCM) is prepared by solution blending. Using Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TG) study the structure and properties of PCM, the optimized preparation techniques of PCM obtained by orthogonal tests. SEM results showed that the PCM was homogeneous structure, binary of fatty acid dispersed in the continuous phase PAN; TGA results indicated that the degradation of the phase change material can be divided into three steps; DSC results showed that the crystallization enthalpy of PCM reached 143.27 J/g, the phase change temperature was around 23°C, and the DSC thermal circulation showed good thermal stability of the PCM; cooling curve showed that the PCM had good heat insulation properties, holding time reached 800s, and after repeated thermal circulation, heat insulation properties remained the same.

Properties of a Solid–Solid Phase Change Material PAN/SA-LA/ZMS

“…In this work, for the purpose of more application ranges with lower phase transition temperature and the longer heat-holding time, zeolite molecular sieve (ZMS) is put into PAN and binary of fatty acids. Experimental results indicate that the crystallization latent heat of this PCM is 125.22 J/g, and its phase transition temperature is about 17 °C; Moreover, its heat-holding time achieved 1 480 s, is far more than the data published in literatures [9,10] .…”

“…In order to improve the crystallization latent heat and the heat-holding time, we prepared OMMT-PAN-Binary of Fatty Acids Blends as PCM in our previous work [10] . It can be seen that the crystallization latent heat of this kind of PCM is 143.27 J/g; its phase change temperature was around 23˚C; and the heat-holding time reached 800s.…”