Abstract
To clarify the effect of direct fluorination on the mechanical properties, tensile tests of pristine and fluorinated PEEK were carried out. The surface states of these specimens during tensile tests were observed. It was found that: (1) The tensile strength and elongation at break of PEEK increased resulting from fluorination treatments. (2) Thinner depth of fluorination had better tensile properties under the same fluorinated temperature. (3) The changes of tensile properties were caused by the difference between the deformation of fluorinated layer and substrate layer. (4) The fracture process of fluorinated PEEK was affected not by fluorinated time but by fluorinated temperature.
