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Comparison of PVAs 1–3 films dissolving time in DI-water. The dissolution time was determined after immersing the PVA films into 100ul of DI-water droplet on parafilm. Dissolution time was compared between three types of PVA: (A) PVA 1 (Mw: 30–70 K, 89–90% Hydrolysed); (B) PVA 2 (Mw: 31–50 K, 98–99% Hydrolysed) and (C) PVA 3 (Mw: 89–98 K, 99% Hydrolysed). Different concentrations were selected for each PVA type, according to the Mw and hydrolysis level.
