Synthesis and application of a novel dicyanide-containing silane coupling agent

Abstract

Silicon-containing arylacetylene (PSA) is a novel resin with excellent heat resistant properties and it has potential application in the field of aerospace. However, Quartz fiber(QF)/PSA composites has poor interfacial adhesion, and commonly used silane coupling agents decompose at high temperatures. In this paper, a novel silane coupling agent DCA was synthesized through the reaction of 2, 3-diamino-2-butenedioleonitrile, 2-keto-glutaric acid, 3-aminophenylacetylene and propyltriethoxysilane. In QF/PSA composites, the surface roughness and surface energy of QF had improved after modified by DCA. Spectral and thermal studies gave evidence for both homopolymerization of propargylic groups and nitrile groups during thermal curing, which indicated that DCA could co-cure with propargylic groups of PSA. After the cylization reactions of nitrile groups, a strong interfacial layer had been formed which could remarkably improve the thermal stability of composites. After modification, ILSS can reach 27.6MPa at room temperature, the retention rate was 54.7% at 500°C.