The introduction of silane into the polymer backbone improves the solubility of the polymer without having a great influence on the thermal stability of the polymer. Therefore, the changes on the main-chain of PAEK we...The introduction of silane into the polymer backbone improves the solubility of the polymer without having a great influence on the thermal stability of the polymer. Therefore, the changes on the main-chain of PAEK were made to gain novel materials containing silane and all the polymers were prepared by low temperature polycondensation method. The glass transition temperatures were evaluated by differential scanning calorimetry(DSC) and the thermal properties were tested by thermal gravimetric analysis(TGA) which showed no mass loss below 350 ℃ in both air and nitrogen atmospheres. All the polymers were completely soluble in organic solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, dimethyl sulphoxide(DMSO), and concentrated sulfonated acid(H-2SO-4). All these PAEK materials containing silane, which show excellent properties, were expected to be applied in composition or function material system.展开更多
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...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.展开更多
A novel controllable cross\|linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, in which sulfur acts as a cross\|linking point. It is found that the cross\|linking reaction could take...A novel controllable cross\|linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, in which sulfur acts as a cross\|linking point. It is found that the cross\|linking reaction could take place at 623 K over a period of 5 h. The novel material has an excellent thermal stability and mechanical properties. It can be processed as convenient as that of pure PEEK before cross\|linking and has a high application temperature as thermosetting resin after cross\|linking.展开更多
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 a...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]展开更多
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 befor...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.展开更多
文摘The introduction of silane into the polymer backbone improves the solubility of the polymer without having a great influence on the thermal stability of the polymer. Therefore, the changes on the main-chain of PAEK were made to gain novel materials containing silane and all the polymers were prepared by low temperature polycondensation method. The glass transition temperatures were evaluated by differential scanning calorimetry(DSC) and the thermal properties were tested by thermal gravimetric analysis(TGA) which showed no mass loss below 350 ℃ in both air and nitrogen atmospheres. All the polymers were completely soluble in organic solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, dimethyl sulphoxide(DMSO), and concentrated sulfonated acid(H-2SO-4). All these PAEK materials containing silane, which show excellent properties, were expected to be applied in composition or function material system.
文摘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.
文摘A novel controllable cross\|linking PEEK was synthesized by introducing thioether moieties into PEEK rigid chain, in which sulfur acts as a cross\|linking point. It is found that the cross\|linking reaction could take place at 623 K over a period of 5 h. The novel material has an excellent thermal stability and mechanical properties. It can be processed as convenient as that of pure PEEK before cross\|linking and has a high application temperature as thermosetting resin after cross\|linking.
文摘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]
文摘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.
