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INTRODUCTION Poly-p-phenylene terephthalamide(PPTA) fibers have been widely used in the national defense and military fields owning to their outstanding properties of high strength,high modulus,light weight and excellent chemical and thermal resistance.However,due to their smooth surface and chemically inertness,the bonding properties between the fibers and resin matrix are poor,which greatly limits fibers application in the field of composite materials.