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Phase-angle delta against temperature, left: PVA 3-82 and PVA 3-82/plasticizer systems; right: PVA 4-88 and PVA 4-88/plasticizer systems, The PVA–plasticizer systems are denoted using abbreviations corresponding to their respective plasticizers: glycerol (GLY), triacetin (TRI), triethyl citrate (TEC) polyethylene glycol (PEG), mannitol (MAN), and sorbitol (SOR) (means of n = 3, + SD), plasticizer proportion is 10 wt%.
