聚醚砜/碳纤维间隔纱发泡复合材料的制备及性能研究OA

In order to overcome the insufficient heat resistance of traditional polymer foams and limitations of the mechanical properties degradation at high temperatures,in this paper,by using solution foaming process,high performance polyethersulfone(PES)resin was selected to prepare polyethersulfone foam(PESF)with light weight,thermal insulation and flame retardance properties.And PESF was combined with carbon fiber spacer fabric(CSF)to create a structure-function integrated multifunctional composite(PESF/CSF).The effects of foaming agent(MDI)content on PESF and its microstructure,volume density,thermal conductivity,mechanical behavior and electromagnetic shielding effectiveness of PESF/CSF material were studied.The results showed that with the increase of MDI content,the foam pore structure changed from finger-like pore to uniform pore struc-ture.PESF and PESF/CSF materials obtained the lowest volume density(0.24 kg·cm-3 and 0.31 kg·cm-3)and showed better mechanical properties with MDI content of 9 wt%,and the plane compression modulus and three-point bending modulus of 9M-PESF/CSF could reach 64.30 MPa and 78.72 MPa,respectively.The e-lectromagnetic shielding test showed that the average shielding effectiveness of 9M-PESF/CSF was 25.6 dB in X band and reflection loss was its main shielding mechanism.The study provides a feasible material design and pro-cessing route for high performance thermal insulating-load bearing-shielding multifunctional composites under ex-treme service environment,which has broad application prospects in the fields of aerospace and construction.