Fig. 4. The appearance of samples degraded in air at 360 °C for 40 min: (a) front view, (b) side view; in air at 450 °C for 40 min: (c) front view, (d) side view; and samples degraded with ZnCl2 at 360 °C for 40 min: (e) front view, (f) side view.
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