Abstract:Silicon-containing arylacetylene terminated by phenylacetylene (PTPSA) was synthesized by Grignard reaction， its structure was characterized and verified by Fourier transform-infrared spectroscopy (FT-IR) 、nuclear magnetic resonance spectroscopy(1H-NMR) and differential scanning calorimeter (DSC). A novel polytriazole (P-PTA3) resin was further synthesized from PTPSA and 1,3,5-tris(azidomethyl)-2,4,6-trimethylbenzene (TAMTMB) via 1,3-dipolar cycloaddition. The unidirectional T700 carbon fiber reinforce P-PTA3 resin composite(T700/P-PTA3) was prepared by compression molding. The curing behaviors of the resin were traced by FT-IR and DSC. The effects of mole ratio of monomers on thermal properties of P-PTA3 resin were studied by dynamic thermos mechanical analysis(DMA) and thermogravimetric analysis(TGA). The storage stability of the resin and tetrahydrofuran(THF)solution was studied by measuring the change of the gel time along with storage time. The gel time was measured under 90℃. The results show that the glass transition temperature(Tg) of cured P-PTA3 resin can reach 304℃ and 5% weight loss temperature(Td5) is 341℃ tested in nitrogen atmosphere when the molar ratio of the alkynyl and triazo is 1.1:1.0, and 5% weight loss temperature(Td5) of different molar ratio of the cured P-PTA3 resins are more than 330℃. The P-PTA3 resin and THF solution can be stored for more than 20 d and 40 d at 35℃ and 25℃ , respectively, and the gel time of the corresponding resin at 90℃ is 24 min and 42 min, respectively, which is better than the existing polytriazole resin solution in storage stability at the same storage temperature. The bending strength of T700/P-PTA3 composite achieved to 1875 MPa, the flexural module achieved to 135.5 GPa, at room temperature, the retention rate of bending strength was 75% under 180℃.