Figure 4.

(A−D) Apparent specific heat capacity (c_p,app, black lines) at the heating rate of 10 K/min, and reversing specific heat capacity (c_p,rev, red lines) at the average heating rate of 2 K/min (p = 120 s) for PLLA after molding at T_mold = 110 °C for the indicated molding times (t_mold). The apparent specific heat capacity (c_p,app) at the average heating rate of 2 K/min (yellow line) is also shown for t_mold = 20 min. The insets are enlargements of the c_p,app and c_p,rev curves. The black dotted lines are the thermodynamic solid and liquid specific heat capacities (c_p^s and c_p^l) of PLLA, adapted with permission from ref (44). Copyright (2005) American Chemical Society.