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.
A novel cross-linkable poly(ether ether ketone ketone) alternating copolymer was synthesized by introducing thio-ether moiety to PEEKK rigid main chain. The copolymer can be processed at 628 K and be cross-linked by annealing at 653 K for 5 h. The cross-linking reaction was caused by the introduced thio-ether moiety instead of the PEEKK moiety. The cross-linked material has better mechanical properties and thermal stability that uncross-liked one. The results will give proof to the further research on controllable cross-linking PEEKK. This material is anticipated to be processed as a thermoplastic material as well as used a as thermosetting material after being cross-linked. [WT5HZ]
Polyesters with silanes in their main chains were synthesized. These polyesters possess interesting properties such as high thermal stability,oxidative stability,low surface energy,water repellency and good dielectric properties.Thermal properties of these silane-containing polyesters were tested by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA).The results show that the polyesters without substitutents have excellent thermal stability and excellent chemical resistance.While polyesters with substituents have good solubility in polar organic solvents such as THF,DMF,DMSO,NMP,DMA and could be made into membrane material easily.These novel silane-containing polyesters could be processed as conveniently as other thermo-plastics and have high application temperature.
