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Above: Flexural stress–strain diagram of the respective PVA grades and the PVA–plasticizer systems, mean ± SD, n = 10; Below: Flexural modulus of the respective PVA and the PVA–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), mean ± SD, n = 10, plasticizer proportion is 10 wt%.
