Preparation and Properties of Polyacrylonitrile Fiber/Binary of Fatty Acids Composites as Phase Change Materials

Abstract

A new kind of form-stable polyacrylonitrile fiber/binary of fatty acids composites as phase change materials was prepared by a solution blending process. In this material, the binary system between stearic acid and lauric acid with different components was served as latent heat storage material and polyacrylonitrile as the supporting material, N,N-dimethylformamide as solvent. Phase change temperature and latent heat and the thermal stability of the polyacrylonitrile/binary of fatty acids composites were characterized using differential scanning calorimetry. The structure, crystalline morphology, surface morphology, and thermal insulation properties of the polyacrylonitrile/binary of fatty acids composites were investigated using Fourier transformation infrared spectroscope, polarizing optical microscopy, scanning electron microscope, and temperature-recording instrument. The Fourier transformation infrared results showed that polyacrylonitrile and binary of fatty acids were combined by intermolecular forces. The differential scanning calorimetry results indicated that polyacrylonitrile/binary of fatty acids composites had high latent heat storage capacity of more than 135.8 J/g, the phase transition temperature was about 25 ı C. The photograph of polarizing optical microscopy and scanning electron microscope suggested that stearic acid and lauric acid were homogeneous distribution in the polyacrylonitrile matrix; Cooling curve of polyacrylonitrile/binary of fatty acids composites showed that its soaking time was continued for about 17.7 minutes, and the thermal insulation properties remain unchanged after more than once cycling. The best process condition was obtained by the soaking time and orthogonal experiment.

Preparation and thermal properties of crosslinked polyurethane/lauric acid composites as novel form stable phase change materials with a low degree of supercooling

“…It can be seen from Fig. 5a, the LA shows obvious crystalline cross-extinction patterns (also reported in previous research 25,26 ), which is different from that of PEG reported in previous study. 27 Seen from Fig.…”

Synthesis and thermal properties of cross-linked poly(acrylonitrile-co-itaconate)/polyethylene glycol as novel form-stable change material

“…It has attracted more and more researchers to explore the PAN as PCM packaging material in recent years [25][26][27][28]. Here, we prepare a novel cross-linked network structure of acrylonitrile copolymer P(AN-co-IA) with itaconic acid (IA) as comonomer.…”

Hydrated salts/expanded graphite composite with high thermal conductivity as a shape-stabilized phase change material for thermal energy storage

“…In order to solve these problems, the shape-stabilized PCMs, which are prepared by incorporating solid-liquid PCMs into supporting materials through encapsulation or impregnation, emerged. The shape-stabilized PCMs based on organic PCMs, including paraffin [7,8], fatty acids [9][10][11] and poly (ethylene glycol) (PEG) [12,13] have been extensively studied owing to the fact that they have suitable energy storage density, no corrosivity and no subcooling. Nevertheless, the inorganic PCMs, especially the hydrated salts, are rarely reported to be prepared into shape-stabilized PCMs, although they enjoy the advantages of high storage density, high thermal conductivity and low cost.…”