High-temperature co-cured phenolic resin damping composite embedded with fluororubber film

To explore the co-curing process of fluororubber (FKM) and phenolic matrix (PF) composites under high-temperature, the free energy of chemical reaction between FKM and PF at 280℃ was simulated and calculated. An orthogonal test method was proposed to optimize the FKM component, in which the molecular functional groups could grow on the matrix by chemical bonds during vulcanization. The process that the resin was cured and the FKM damping material was vulcanized simultaneously was developed. FKM was dissolved by tetrahydrofuran which was a strong polar solvent, the FKM solution was coated on the fiber to form a damping film, and then the film was embedded in PF prepreg. On the basis of not changing the curing process curve of phenolic resin, the preparation of phenolic matrix high-temperature co-curing composite embedded with fluororubber film (PMHCCEFF) was completed. The properties of the composites were characterized by FTIR, SEM, EDS, X-ray and free vibration attenuation tests. The results showed that fluororubber could react with phenolic matrix to form a stable structure, the shear stress of the specimen after co curing can reach 8.2 MPa. The conclusion will lay the foundation for the wide application of the high-temperature resistant and large damping phenolic resin composites.