In situ formation of a carbon nanotube buckypaper for improving the interlaminar properties of carbon fiber composites

To improve the interlaminar properties of carbon fiber reinforced polymer composites (CFRPs), a hybrid fiber mat (i-MBP-PCF) was prepared by in situ deposition of a multiwalled carbon nanotube buckypaper (i-MBP) on the surface of functionalized CF fabric (PCF). The effect of the hybrid fiber mat on the interlaminar and electrical properties was systematically investigated. The results showed that the i-MBP-PCF hybrid fiber mat showed excellent interlaminar and electrical property enhancement functions. The interlaminar shear strength (ILSS), Mode-II interlaminar fracture toughness (GIIC), and electrical conductivity in the out-of-plane direction of i-MBP-PCF/EP increased 68.6%, 44.4%, and 6080%, respectively, compared to those of the CF/EP composite. [Display omitted] •A novel hybrid fiber mat was prepared by in situ depositings of a carbon nanotubes buckypaper on a modified carbon fabric.•The hybrid fiber mat showed excellent interlaminar shear and electrical properties enhancement effects.•Composites’ interlaminar shear strength (59MPa) and mode-II toughness (650J/m2) increased by 68.6% and 44.4% respectively.•The electrical conductivity in the out-of-plane and the in-plane direction increased by 6080% and 7 folds respectively.•The hybrid fiber mat has huge application potential in aerospace, conducting elements, and structural materials.