Improved mechanical performance of PBO fiber-reinforced bismaleimide composite using mixed O2/Ar plasma

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摘要：

The mixed O2/Ar plasma was employed to enhance mechanical properties of the PBO/bismaleimide composite. The interlaminar shear strength was improved to 61.6MPa or by 38.1%, but the composite brittleness increased. The plasma gas compositions exhibited notable effects on the interfacial adhesion strength. XPS results suggested that the mixed plasma presented higher activation effects on the surface chemical compositions than pure gas plasmas and a larger number of oxygen atoms and hydrophilic groups were introduced on the fiber surface due to the synergy effect, but the synergy effect was considerably performed only within the O2 percentage range of 40–60%. The fibers surface was increasingly etched with growing the O2 contents in the plasma, deteriorating the fibers tensile strength. SEM micrographs demonstrated that the composite shear fracture changed from debonding to cohesive failure in the matrices, and the improving mechanisms were discussed.

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关键词：

Experimental/ adhesion brittleness etching fibre reinforced plastics filled polymers fracture hydrophilicity polymer fibres scanning electron microscopy shear strength surface composition tensile strength X-ray photoelectron spectra/ mechanical properties poly(p-phenylene benzobisoxazole) fiber reinforced bismaleimide composite mixed oxygen-argon plasma interlaminar shear strength composite brittleness plasma gas composition interfacial adhesion strength XPS X-ray photoelectron spectra surface chemical composition hydrophilic groups fiber surface synergy effect etching tensile strength SEM composite shear fracture debonding cohesive failure scanning electron microscopy poly(p-phenylene benzo- bisoxazole) fiber/ A8140L Deformation, plasticity and creep A6220F Deformation and plasticity A6220M Fatigue, brittleness, fracture, and cracks A8140N Fatigue, embrittlement, and fracture A8190 Other topics in materials science A8280P Electron spectroscopy for chemical analysis (photoelect