Abstract
Shape-stabilized phase change materials (SPCMs) are green, reusable energy storage materials. Because the melting temperature of n-alkyl acrylate copolymer is adjustable by controlling the side-chain length, the appropriate melting temperature can be achieved. Poly(tetradecyl acrylate-co-hexadecyl acrylate) (P(TDA-co-HDA)) with a molar ratio of 1:1 and SPCMs were fabricated via an atom transfer radical polymerization (ATRP) method and a solution blending method with P(TDA-co-HDA) as a thermal storage material and graphene oxide (GO) as a supporting substance. In this composite, an SPCM was achieved, which absorbed heat at 29.9 °C and released it at 12.1 °C with a heat storage capacity of 70 J/g at a mass ratio of GO of 10%. The material retained its shape without any leakage at 60 °C, which was much higher than that of the melting temperature of P(TDA-co-HDA). The SPCMs exhibited good crystallization behaviors and excellent thermal reliabilities after 100 thermal cycles. The thermal properties of the P(TDA-co-HDA)/GO composite PCMs with various GO loadings were also investigated. The novel shape-stabilized PCMs fabricated in this study have potential uses in thermal energy storage applications.
Highlights
Increasing greenhouse gas emissions and fossil fuel consumption fueled the exploration of more efficient renewable energy sources [1,2]
Fourier-transform infrared (FTIR) spectra of the P(TDA-co-hexadecyl acrylate (HDA)) and stabilized phase change materials (SPCMs) are shown in Figure 1.Characteristic bands of graphene oxide (GO) appeared at 3434 cm−1 (C–OH stretching), 1737 cm−1 (C=O stretching), 1634 cm−1 (C=C stretching vibration), and 1057 cm−1 (C–O of epoxy stretching)
For P(TDA-co-HDA), characteristic bands were present at 1737 cm−1 (C=O stretching) and 1250 and 1176 cm−1
Summary
Increasing greenhouse gas emissions and fossil fuel consumption fueled the exploration of more efficient renewable energy sources [1,2]. Energy savings could be realized by thermal energy storage systems that use phase change materials (PCMs) [6,7,8]. Polymers 2019, 11, 1113 shape-stabilized phase change materials (SPCMs) attracted extensive interest for latent heat energy storage in recent years. Qi et al [22] fabricated PEG/GO shape-stabilized PCMs by introducing GO as the supporting material using a blending method. PCMs by introducing GO as the supporting material using a simple solution blending method This fabricated novel shape-stabilized PCMs (P(TDA-co-HDA)/GO nanocomposites) are named SPCMs. The morphological variations, phase change behaviors, thermal reliabilities and stabilities, and crystalline properties of the composite materials were investigated
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