Processable and recyclable crosslinking solid-solid phase change materials based on dynamic disulfide covalent adaptable networks for thermal energy storage

Weibo Kong, Yunyun Yang, Anqian Yuan, Liang Jiang, Xiaowei Fu, Yuechuan Wang, Hualiang Xu, Zhimeng Liu and Jingxin Lei

Energy, 2021, vol. 232, issue C

Abstract: Generally, the chemically crosslinking solid-solid phase change materials (PCMs) are fabricated to address the issues of leakage and poor mechanical properties of traditional PCMs. However, the solid-solid PCMs also bring environmental pollution and resources waste as the permanent chemically crosslinking polymers cannot be recycled and reprocessed once molded. Herein, we reported a dynamic-covalent- crosslinking PCMs (V-PCMs) consisting of polyethylene glycol (PEG) as phase change ingredient, polyaryl polymethylene isocyanate (PAPI) as crosslinking points and disulfide as dynamic bonds. The as-prepared V-PCMs can reversibly store and release heat via melting and crystallization of PEG chains, and exhibit anti-leakage performance and solid-solid phase change merit due to chemically crosslinking networks even above melting point (Tm) of PEG. Besides, the V-PCMs show recycling and reprocessing ability from association mechanism of dynamic disulfide bonds. Also, the recycled V-PCMs can reversibly store and release heat and exhibit solid-solid phase change characteristic as original V-PCMs. This method provides a promising way for the fabrication of chemically crosslinking solid-solid PCMs with recyclability and multi-functionalization.

Keywords: Phase change materials; Solid-solid; Covalent adaptable networks; Vitrimer; Disulfide (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:232:y:2021:i:c:s0360544221013189

DOI: 10.1016/j.energy.2021.121070

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