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.
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.
