《Table 1 Comparison of interfacial shear strength for untreated and oxygen plasma modified Suplonfi

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《Characterization of Oxygen Plasma Modified Polyimide Fibers Interfacial Adhesion Performance by Single Fiber Fragmentation Test》

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The SFFT w as used to analyze the influence of oxygen plasma modification on the interfacial bonding properties of PI fibers.As show n in Fig.4（a），the morphology of the resin around the breakpoints of fiber w as hollow.And there w as no trace of strong action betw een untreated Suplonfiber and resin.That is to say，the untreated Suplonfiber had debonded and slipped in the matrix.It indicated that the poor interface compatibility betw een fiber and resin caused by the smooth and chemical inertness of Suplonfiber.In addition，the cracks at the oxygen plasma modified Suplonfiber breakages are show n in Fig.4（b），w hich indicated that the interface compatibility betw een the fiber and the resin became stronger.It can be further proved by the results as show n in Table 1，the critical length of PI fiber decreased from 276.41μm to 196.02μm after oxygen plasma modification.And the interfacial shear strength of treated fiber w as 54%higher than untreated fiber.