PREPARATION METHOD FOR POLYIMIDE INTERLAYER TOUGHENED FIBER COMPOSITE MATERIAL, FIBER PREFORM, AND COMPOSITE MATERIAL PANEL

The present invention provides a preparation method for a polyimide interlayer toughened fiber composite material. The method comprises the following steps: A) preparing a polyimide spinning solution; and B) using an electrostatic spinning method to spray the polyimide spinning solution onto the surface of a fiber cloth or of a prepreg, obtaining a polyimide interlayer toughened fiber composite material; the polyimide spinning solution has different concentrations, and the polyimide interlayer toughened fiber composite material has different polyimide layer micro/nano structural morphology. The present application further provides a fiber preform and a composite material panel. The preparation method of the polyimide interlayer toughened fiber composite material provided in the present application allows for adjusting the concentration of the electrospinning solution to construct different micro/nano structural morphologies, and different structural morphologies trigger different toughening mechanisms, furthe