“…Thanks to their elevated specific phase change enthalpy, narrow transition temperature interval, limited supercooling, lightness and cheapness, organic PCMs, i.e., paraffins, poly(ethylene glycol) (PEG) and fatty acids, are probably the most widely diffused (Dorigato et al, 2017;Fredi et al, 2017). In particular, PEG is a versatile and biodegradable PCM with elevated melting enthalpy, tunable transition temperature range, elevated thermal stability, good biocompatibility, non-toxicity and noncorrosiveness (Sundararajan et al, 2016;Kou et al, 2019). Because of these peculiar properties, researchers have recently put much efforts to synthesize novel PCMs based on PEG, trying to physically blend PEG with other supporting materials, to perform chemical modifications to prepare PEG based solid/solid PCMs or to impregnate PEG in porous materials (Wang et al, 2016;Yang et al, 2016;Zhou et al, 2018).…”