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Schematic pictures of the thermal analysis module in the heating (a) and cooling (d) processes. (b, c) Thermal analysis of undrawn PVA-5, drawn PVA-0, and drawn PVA-5 films of similar sizes (highlighted by the dotted red boxes) during the heating process. (e, f) Thermal analysis of the drawn PVA-0 and PVA-5 films (highlighted by the dotted white boxes) during the cooling process. F is Fahrenheit.
