Preparation and Properties of Form-Stable Phase Change Materials Polyacrylonitrile Fiber / Stearic Acid Blends

Abstract

With stearic acid (SA) as phase change material, waste polyacrylonitrile fiber (PAN) as framework material, N,N-dimethylformamide (DMF) as solvent, form-stable PAN/SA blends phase change materials (PCM) are prepared by solution blending process. Phase change temperature and latent heat and the thermal stability of the PAN/SA PCM are characterized using Differential Scanning Calorimetry (DSC). The structure, crystalline morphology, and thermal insulation properties of the PAN/SA PCMs are investigated using Fourier transformation infrared spectroscope (FTIR), polarizing optical microscopy (POM), and temperature-recording instrument. The FTIR and POM results show that PAN and SA are combined by intermolecular forces, and SA is homogeneous distribution in the PAN matrix. The DSC results indicate that PAN/SA PCMs have high latent heat storage capacity of more than 115J/g, the phase transition temperature and phase transition enthalpy of the PCMs increase with increasing the mass percent of SA. Cooling curve of PAN/SA PCMs show that the PCMs have good insulation properties, the soaking time is continued for about six minutes, and the thermal insulation properties remain unchanged after five and ten times of thermal cycling. The best process condition is obtained by the soaking time and orthogonal experiment.

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.…”

Shape-stabilized phase change materials based on poly(ethylene-graft-maleic anhydride)-g-alkyl alcohol comb-like polymers

“…EMA exhibits a melting (T m ) and crystallization (T c ) peak at 100.0 and 86.2°C, respectively, which is originated from polyethylene components. For C n H 2n þ 1 OH (n ¼14, 16,18,26), T m , T c and heat enthalpy (ΔH m ) exhibit a linear-increment tendency with the side-chain length (Fig.3, right). When n changes from 14 to 26, they increase from 44.9 to 79.8°C, 33.3 to 71.0°C and 225.3 to 252.3 J/g.…”

“…The EMA-g-C n H 2n þ 1 OH CLPPCMs are prepared through the esterification reactions between EMA and n-alkyl alcohol (C n H 2n þ 1 OH, n ¼14, 16,18,26). Firstly, EMA and C n H 2n þ 1 OH were dissolved into toluene, and then 5 wt% PTSA was added.…”

“…In this study, a series of poly(ethylene-graft-maleic anhydride) polymers with different side-chain length of n-alkyl alcohols (C n H 2n þ 1 OH, n ¼14, 16,18,26) were synthesized as comb-like polymeric PCMs (EMA-g-C n H 2n þ 1 OH) through modification technique. Thermal properties and thermal stability of these CLPPCMs were determined by DSC and TG analysis.…”

“…Shape-stabilized PCMs can be obtained through the PCMs mixture containing inorganic nanofillers [17][18][19][20][21][22][23][24][25], or the organic matrix [26][27][28] and the polymeric-based PCMs [29][30][31]. Based on the covalent grafting and the supports of polymeric main-chains, polymeric-based PCMs exhibit an obvious advantage over the other two.…”