In recent years, the rapid development of aerospace vehicles urgently needs materials with high temperature resistance, light weight and high strength, which provides a good opportunity for the development of high temperature resistant polymer matrix resins. The polytriazole resin prepared by the 1,3-dipolar cycloaddition of an azide group and an alkynyl group has excellent heat resistance due to a rigid triazole ring in the main chain. The thermal properties of the polytriazole resin can be further improved by increasing the functionality of the polytriazole resin and the crosslinking density of the cured resin. In this work, a novel polytriazole resins Si-PTA3 were synthesized from silicon-containing multi-aromatic acetylene compounds (PSA) and 1,3,5-triazidemethyl-2,4,6-trimethylbenzene (TAMTMB) via 1,3-dipolar cycloaddition. The rheological properties of the Si-PTA3 resins were studied by rotating rheometer, the curing behaviors of the resins were traced by infrared spectra analysis and differential scanning calorimetry, the thermal properties and the effect of mole ratio of monomer on thermal properties were studied by dynamic mechanical analysis and thermogravimetric analysis. T700 carbon fiber-reinforced Si-PTA3 composites T700/Si-PTA3 were prepared by compression molding, and the mechanical properties of the composites were characterized by a tensile machine. The results showed that Si-PTA3 resins had good processing properties and can be cured at 80℃. The cured resin had excellent thermal properties, the best molar ratio of alkynyl group to azide group was 1.1:1.0, the glass transition temperature (Tg) and 5% weight loss temperature (Td5) reached 334 and 351℃, respectively. With the increase of the alkyne ratio, Tg decreased gradually, and Td5 reached more than 341℃. Composites T700/Si-PTA3 had good mechanical and thermal properties, the flexural strength at ambient temperature was higher than 1670 MPa and their retention rate at 250℃ was more than 67%. The Si-PTA3 resins can be used as a matrix of high temperature resistant resin composites.
Wenmei LUO Liqiang WAN Shuaishuai ZHU Chao FU Xinyue HAN Farong HUANG
. Preparation of a novel polytriazole resin based on silicon-containing multi-aromatic acetylene compounds[J]. The Chinese Journal of Process Engineering, 2019
, 19(5)
: 1022
-1029
.
DOI: 10.12034/j.issn.1009-606X.219119
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