Impregnation of Composite Materials Based on Long Carbon Fibers with a Thermoplastic Binder When Producing Prepreg

The filtration of liquid in carbon fibers during their impregnation is considered. A quantitative relationship has been proposed between the mechanical compressive properties of long flat carbon threads and their permeability coefficient in the direction perpendicular to the surface of the thread. A model based on a nonstationary solution of a one-dimensional filtration problem has been developed for calculating the process of impregnation of fibers with a thermoplastic binder. As a result of a comparative analysis of experimental and calculated data, the dynamic viscosity of the melt and an analogue of its surface tension forces were assessed.