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Issue 38, 2019
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Thermally reliable, recyclable and malleable solid–solid phase-change materials through the classical Diels–Alder reaction for sustainable thermal energy storage

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Abstract

Conventional solid–solid phase-change materials (SSPCMs) exhibit good thermal energy storage (TES) ability and shape stability, but they cannot be recycled and re-shaped once fabricated due to the chemical cross-links. Hence, endowing SSPCMs with recyclability and malleable properties is advantageous for numerous applications, and contributes to environmental protection. Herein, a novel class of dynamic cross-linked SSPCMs (DC-PCMs) was facilely fabricated by bonding polyethylene glycol (PEG) to a polymeric skeleton through the thermally reversible Diels–Alder (DA) reaction for sustainable TES. PEG segments function as energy-storage units, while the polymeric skeleton affords shape stability and robust mechanical properties. The crystalline structure of DC-PCMs was investigated by X-ray diffraction (XRD), polarized optical microscopy (POM) and differential scanning calorimetry (DSC). DSC characterization also confirms the reversible energy-capture and release ability of DC-PCMs. The results suggest that SSPCMs show typical solid–solid phase transitions within the temperature range from 40 °C to 70 °C and can achieve a high latent heat storage capacity of about 107.2 J g−1. Meanwhile, the thermally reversible DA reaction endows the DC-PCMs with good thermal recyclability and solid-state plasticity. After multiple thermal cycles, DC-PCMs can retain the original mechanical properties and TES ability. Moreover, the DC-PCMs are highly scalable for practical applications because of their uncomplicated and cost-effective fabrication.

Graphical abstract: Thermally reliable, recyclable and malleable solid–solid phase-change materials through the classical Diels–Alder reaction for sustainable thermal energy storage

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Supplementary files

Article information


Submitted
01 Aug 2019
Accepted
05 Sep 2019
First published
06 Sep 2019

J. Mater. Chem. A, 2019,7, 21802-21811
Article type
Paper

Thermally reliable, recyclable and malleable solid–solid phase-change materials through the classical Diels–Alder reaction for sustainable thermal energy storage

B. Wu, Y. Wang, Z. Liu, Y. Liu, X. Fu, W. Kong, L. Jiang, Y. Yuan, X. Zhang and J. Lei, J. Mater. Chem. A, 2019, 7, 21802 DOI: 10.1039/C9TA08368E

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