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

Abstract

In this article, a series of crosslinked polyurethane/lauric acid composites was prepared as form stable phase change materials (FSPCMs) through a brief and solvent-free method. In the FSPCMs, lauric acid functioned as a phase change substance, and crosslinked polyurethane simultaneously functioned as a supporting material and phase change substance. Compared with traditional supporting materials in FSPCMs, the crosslinked polyurethane here obviously reduces the loss of latent heat from the supporting material and reduces the degree of supercooling of the obtained FSPCMs. The obtained FSPCMs were extensively studied by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), polarizing microscopy (POM), differential scanning calorimetry (DSC), thermal cycling tests and thermogravimetric analysis (TGA). The FTIR confirmed the chemical structure of the obtained FSPCMs. The XRD and POM results indicated that the FSPCMs exhibit comprehensive crystalline properties of polyurethane and lauric acid. DSC data showed that the FSPCMs have superior phase change properties with the phase change temperature and latent heat in the range of 26-38 C and 90-131 J g À1 . Moreover, low or no supercooling of the obtained FSPCMs was detected by DSC. The phase change temperature is suitable in the fields of solar energy saving and building engineering. Thermal cycling tests and thermogravimetric analysis (TGA) proved the good thermal reliability and stability of the obtained FSPCMs.

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

“…The second way is utilizing synergistic crystallization of PCMs. Kong et al prepared a composite PCM containing PEG‐based polyurethane (PU) and lauric acid (LA). Because of the synergy crystallization (overlap of the phase change process of PEG and LA), the supercooling degree was reduced.…”

Hydrophobic and Melt Processable Starch‐Laurate Esters: Synthesis, Structure–Property Correlations

“…This was because the starch has swollen enough via the pyridine at the reaction temperature that provided access for the substitution of OH with lauric acid to occur in regions that are not otherwise accessible. Additionally, a small new peak emerged at 2θ of 8° that could be attributed to the crystallization of laurate . Kong et al reported similar crystallization of lauric acid in polyurethane (PU) conjugates as a result of a combination of peaks of PU and lauric acid substituent.…”

“…Additionally, a small new peak emerged at 2θ of 8° that could be attributed to the crystallization of laurate . Kong et al reported similar crystallization of lauric acid in polyurethane (PU) conjugates as a result of a combination of peaks of PU and lauric acid substituent.…”

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

“…Form‐stable composite PCMs can also be fabricated by encapsulating PCMs within polymer‐based materials with a network structure via melt blending or vacuum impregnation. Researchers have prepared form‐stable composite PCMs using various supporting components such as high‐density polyethylene (HDPE), low‐density polyethylene (LDPE), polypropylene (PP), acrylic resins, poly(methyl methacrylate) (PMMA), epoxy, polyurethane (PU), and poly(vinyl chloride) (PVC) …”