Structure and properties of BPDA/PDA polyimide fibers

Abstract

Polyimide/graphene (PI/G) composite fibers containing p-phenylenediamine ( p-PDA), 3,3′,4,4′-Biphenyl tetracarboxylic diandhydride (BPDA) and graphene (G) were prepared by wet spinning and thermal imidization. The mechanical properties, thermal stability, orientation factor and morphology of PI/G composite fibers were characterized and studied. Within the scope of the study, the tensile strength and tensile modulus of the fibers increased first and then decreased with the increase of the graphene content. Moreover, the glass transition temperature and thermal decomposition temperature of the PI/G composite fibers increased with the increased of the graphene content. X-ray diffraction (XRD) showed that the degree of orientation of the of prepared fibers increase firstly and then decrease with the content of graphene increasing. SEM indicated that graphene was dispersed evenly in the PI/G composite fibers and graphene had satisfactory compatibility with PI matrix.