Effect of surface modification of fly ash on the mechanical, thermal, electrical and morphological properties of polyetheretherketone composites

► Preparation of high performance poly (ether ether ketone) (PEEK)/fly ash (FA) composites. ► Characterization studies like DMTA, MDSC, FTIR and SEM have been carried out. ► Addition of modified FA, decrease Tc by 58 °C, due to the hindrance in PEEK molecular mobility during the cooling crystallization process. ► Modified fly ash filled PEEK composites exhibit higher tensile strength and modulus than the unmodified ones.