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In situ observation of the electromechanical instability in thermoplastics. (a) Experimental setup for the in situ observation. (b) Microscopic image of the flat surface of the PTBA at 100 °C. The patterns of the creasing-cratering instability on the surfaces of (c) the PTBA at 100 °C, (d) polystyrene at 130 °C, (e) parafilm at 70 °C, (f) polymethyl methacrylate at 150 °C. (g) The surface topology of polymethyl methacrylate after the creasing-cratering instability.
