Dynamic mechanical analysis(DMA) was used to investigate the dynamic mechanical and thermal properties of the controllable cross-linking poly(ether ether ketone)s containing thioether bond and pure poly(ether ether ketone). The processes of cross-linking reaction were monitored with the changes in storage modulus(E′) and tanδ with the change of temperature. The storage modulus(E′) increases in the high temperature region and tanδ shifts toward high temperature with increasing the degree of cross-linking. Comparing dynamic mechanical properties of pure poly(ether ether ketone) with that of the controllable cross-linking poly(ether ether ketone)s, we can conclude that the cross-linking reaction could occurred at the sites of thioether bonds. The novel polymer can be processed as conveniently as thermoplastic material before cross-linking and has a high application temperature as thermosetting material after cross-linking. It can be applied to a new technological region.
Soluble poly(aryl ether ketone)s containing thioether moieties that provide crosslinking function group were synthesized. These polymers exhibit an excellent solubility in general organic solvent. The properties before and after irradiation were investigated by differential scanning calorimetry(DSC), thermogravimetric analyses(TGA) and gel permeation chromatography(GPC). The GPC results indicate that the irradiated polymer exhibited an increasing molecular weight with increasing the irradiation dose. The DSC and TGA results also demonstrate that the glass transition temperature and thermal stability of the irradiated polymer were higher than those of un-irradiated polymer. The tensile strength and modulus of irradiated polymer increased, while the elongation at break decreased with increasing the irradiation dose.
Blends of inorganic nano zirconium dioxide(ZrO-2) and poly(ether-sulfone)(PES) were prepared by mechanical blending. Their mechanical, thermal and electrical properties were investigated. Compared with pure PES, this kind of organic/inorganic nano-composite exhibit a better electrical property, lower coefficients of thermal expansion, as well as a similar thermal properties. The mechanical properties are composition-dependent.
