FIGURE 3.
Thermal properties of PEN foil. (A) Temperature-dependent heat capacity cp. The peak at 269°C indicates an endothermal melting transition, and the rise above 400°C is due to dissociation. (B) Temperature-dependent weight loss for a slow heating rate, with dissociation starting at 407°C and ending at ≈500°C. The dissociation temperature defined by half of the total weight loss is ≈450°C. For very fast heating rates such as in pulsed laser catapulting, it will probably be higher because dissociation is a rate process that depends on both temperature and time.