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Date of Publication:2022-10-09

Journal:高分子学报

Affiliation of Author(s):化工学院

Issue:3

Page Number:323-335

ISSN No.:1000-3304

Abstract:Surface modification of high-performance continuous fibers was carried
   out by inductively coupled plasma (ICP) and dielectric barrier discharge
   (DBD) cold plasma, respectively. The effects of treatment time,
   discharge power and pressure on the chemical composition, morphology and
   wetting ability of the fiber surface were investigated by X-ray
   photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and
   dynamic contact angle analysis (DCA). The relationship between interface
   structure and interfacial adhesion, and the failure mechanism of the
   fibers reinforced bismaleimide (BMI) composites were discussed. The
   results indicated that the treatment of PBO fibers by O_2, Ar and mixed
   O_2/Ar ICP, respectively, would result in the decomposition of the
   phenyl rings and oxazole moieties on the fiber surface, along with the
   formation of some polar groups and active groups, such as ester bonds,
   amide bonds and free radicals. Sputtering and etching of plasma also
   brought about a rough morphology for fiber surface. The modification
   effect by Ar ICP was better than that by O_2 ICP, and O_2/Ar ICP
   presented the best activation effect on the chemical compositions of PBO
   surface due to the synergy effect. The optimum ratio of O_2/Ar mixture
   was 40% - 60% of O_2 content. The interlaminar shear strength (ILSS) of
   PBO/BMI composite treated with O_2/Ar ICP was 61.6 MPa, an increase by
   38.1% compared with that of the untreated samples. The DBD plasma also
   improved the polarity, reactivity and the morphology of the PBO fiber
   surface. The effect of enhancement in ILSS values of PBO/BMI composites
   treated by O_2 DBD was better in comparison with that treated by air
   DBD. The ILSS value was increased to 57.1 MPa at 12 s when treated at 30
   W/cm~3 by air DBD plasma, while that of PBO/BMI composites treated by
   oxy-DBD plasma under the same condition was 62 MPa. Scanning electron
   microscopy (SEM) micrographs demonstrated that the fracture failure
   mechanism of PBO/BMI composites treated by ICP or DBD plasma shifted
   from interface failure to matrix failure. Finally, the relationship
   between the aging behavior of the fiber surface and the interfacial
   property of the fiber reinforced BMI composites were also discussed.
   ILSS values of PBO/BMI composites decreased with storage time for the
   fibers treated by plasma.

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