Graft poly(ethylene glycol)-based thermosetting phase change materials networks with ultrahigh encapsulation fraction and latent heat efficiency

Xiaowei Fu, Yuan Lei, Yao Xiao, Jiliang Wang, Shiyi Zhou and Jingxin Lei

Renewable Energy, 2021, vol. 179, issue C, 1076-1084

Abstract: Graft phase change materials (GPCMs) networks with pendent side chains of phase change component trend to simultaneously enhance the encapsulation fraction and latent heat efficiency, leading to ultrahigh latent heat, compared to backbone phase change materials (BPCMs) networks with skeleton chains of phase change component. Herein, the GPCMs networks containing graft polyethylene glycol (PEG)-based side chains were synthesized via a facile high efficiency esterification approach between hydroxyl and anhydride as well as between resulting carboxyl and aziridine ring. The GPCMs had much higher normalized latent heat (from 122.6 kJ/g to 157.6 kJ/g) and latent heat efficiency (from 0.76 to 0.93) than BPCMs (from 79.3 kJ/g to 130.6 kJ/g and from 0.49 to 0.77) networks counterparts with various molecular weight (from 2 kDa to 20 kDa) of used PEGs. Also, GPCMs could reach experimental latent heat of 155 J/g with ultrahigh PEG weight fraction of 98.8% and high latent heat efficiency of 0.93 resulting from the promoted crystallization, while GPCMs showed good solid-solid phase change behavior, high thermal reliability and stability, which could not be realized in conventional BPCMs. The synergetic enhancement of PEG weight fraction and latent heat efficiency in GPCMs is due to the decreased non-PEG components and the existence of free molecular end of PEGs in GPCMs. The efficient strategy of constructing graft side chains of PEGs can enable an obvious increase in both PEG weight fraction and latent heat efficiency in solid-solid PCMs network, further leading to a significant increase in latent heat.

Keywords: Phase change materials; Ultrahigh encapsulation; Ultrahigh latent heat efficiency; Graft side chain (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:renene:v:179:y:2021:i:c:p:1076-1084

DOI: 10.1016/j.renene.2021.07.102

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