Elastic and tensile properties of aromatic polyamideimide composite films with aromatic polyamide fiber reinforcements having various textures and fiber orientations

摘要

AbstractAromatic polyamideimide (PAI) films were reinforced with aromatic polyamide fiber (DuPont, Kevlar 49) as unidirectional composite (type I), bidirectional laminate composite (type II), and bidirectional cloth composite (type III). The elastic and tensile load‐elongation properties of composite films at ambient temperature were investigated with respect to fiber orientation. The properties of the type I composite film are more anisotropic than those of other composite films. But, for the type I composite film, the most significant effect of the reinforcement fiber is observed at the fiber direction. With bidirectional reinforcement (type II and III) the anisotropy of the composite is reduced, but the strengths at the fiber directions are depressed markedly by the existence of the fibers of the other orientation