In the present work, the isothermal crystallization of
PEEK was studied by using DSC. The level off time
determined from the Avrami analysis will be compared with
the minimum induction time for the occurrence of the
double melting peaks. From the TMDSC experiments, the
melting behavior and the mechanisms of single- and doublemelting
peak are discussed. The results indicated that the
double-melting peak was attributed to both mechanisms of
two different morphologies and melting–recrystallization.
The origin of double-melting peak depends on the
temperature and time of isothermal crystallization.