By using PLM (polarized light microscopy) with heating stage
SEM
IR
and DSC techniques
the spherulitic structure of polyetheretherketon (PEEK) has been studied. It has been found that the spherulite of PEEK shows radiated morphology or banded morphology in some case
and the two morphologies can interchange reversi'blely in thermal process. The interchanging characteristics and the microstructure of them have been investigated. Basing on the results a spherulitic model of PEEK has been given.