Aging behavior of PBO fibers and PBO-fiber-reinforced PPESK composite after oxygen plasma treatment

摘要

Aging behavior of poly(p-phenylene benzobisoxazole) (PBO) fibers and PBO-fiber-reinforced poly(phthalazinone ether sulfone ketone) (PPESK) composites after oxygen plasma treatment was investigated. Surface chemical composition, surface roughness and surface morphologies of oxygen-plasma-treated PBO fibers before and after aging in air for 1, 3, 5 and 10 days were analyzed by XPS and atomic force microscopy (AFM). The effects of aging on the material were examined by interlaminar shear strength (ILSS) and water absorption measurements. The results indicate that the major aging behavior of the fibers and the composite appeared in the first few days after oxygen plasma treatment, whereas minor aging effects were observed with prolonged aging.