Recyclable solid‐solid phase‐change materials cross‐linked by reversible oximecarbamate bonds for solar energy storage
Anqian Yuan, Bo Wu, Yi Wang, Yuanyang Zhao, Qinfeng Liu, Jingxin Lei
Abstract
Polymeric solid-solid phase-change materials (SSPCMs) possessing excellent shape stability and adaptability are able to store renewable thermal energy in an economically feasible and environmentally friendly way. Integration of chemical cross-links colorless and recyclability in a single SSPCM is challenging and interesting at present. Herein, the oximecarbamate bond was firstly introduced in chemically cross-linked polyurethanes to prepare recyclable SSPCMs, in which finely dispersed PEG segments function as phase-change components as well as polymeric skeletons. The excellent thermal energy storage capacity (with the enthalpy reached up to 101 J/g) and remarkable thermal stability of the synthesized SSPCMs had been confirmed. Moreover, the as-prepared SSPCMs can be recycled and reprocessed by simple hot pressing because of the reversibility of oximecarbamate bond. This SSPCM combines good thermal storage capacity and appealing recyclability, exhibiting sustained usability for energy storage.