Ion irradiation effects on thermal and mechanical properties of poly(ether-ether-ketone) (PEEK)

The change in thermal properties induced by irradiation of 10 MeV H+, 20 Me V He2+ and 2 MeV electron were studied for noncrystalline and crystalline p oly(ether-ether-ketone) (PEEK), PEEK-a and PEEK-c, by differential scanning calorimetry (DSC). It was revealed from the analysis of thermal parameter changes that crosslinking proceeds by irradiation in all cases studied. The comparison of effects between ion and electron irradiations led to a concl usion that probability of crosslinking in the ion irradiation is extremely large compared with that in the electron irradiation. It was clarified from isothermal crystallization that ion gives more severe damage to crystallit e than electron. The tensile properties for PEEK-a were varied in accord wi th difference in thermal properties between ion and electron irradiations, whereas for PEEK-e the difference in those between ion and electron irradia tions was scarcely observed. (C) 1999 Published by Elsevier Science Ltd. Al l rights reserved.