Fig. 4: Variable temperature IR spectra. | NPG Asia Materials

Fig. 4: Variable temperature IR spectra.

From: Colossal barocaloric effect achieved by exploiting the amorphous high entropy of solidified polyethylene glycol

Fig. 4

IR of a single PEG10000 and b PEG10000/PET15000 covering transition temperature Tt. For the crystalline state at 295 K, the vibration bands of each functional group/bond of single PEG10000 all appeared in PEG10000/PET15000 with almost unchanged vibration frequencies, implying that the conformations of the PEG chain in PEG10000/PET15000 remained nearly the same as those of single PEG in the crystalline state. The main difference appears between the liquid and amorphous states above Tt. The evolution of specific bands of primary CH2 groups over a temperature range including Tt for c single PEG10000 and d PEG10000/PET15000. The band at 1022 cm−1 (b) is attributed to the aromatic C–H deformation vibration of PET, which remains unchanged across the phase transition of PEG.

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