Recyklovatelné kompozitní materiály s vláknovou výztuží – možnosti a limity v automobilovém průmyslu

Abstract

This thesis examines the recyclability of fiber-reinforced polymer composite materials. It focuses primarily on the possibilities and limitations of recyclable materials and their secondary use in the automotive industry. The theoretical part of the thesis provides an overview of current matrix systems used in fiberreinforced composites, ranging from classic thermosetting epoxy resins through chemically recyclable thermosets to thermoplastic matrices. Emphasis is placed on comparing the recyclability, technological complexity, and application potential of individual approaches. The experimental part focuses on the fabrication and comparison of flexural mechanical properties of three composite systems: a conventional epoxy laminate with carbon fabric (CFRP), a composite with chopped carbon fibers (forged carbon, FC), and a 3D-printed composite with an Onyx matrix and continuous carbon fiber. The three-point bending test demonstrated the highest average flexural strength in the CFRP samples (559 MPa), followed by FC (236 MPa) and Onyx (90 MPa), with the Onyx samples remaining intact during the test and exhibiting ductile behavior due to the polyamide matrix. The three-point bending test conducted on a demonstration shift paddle confirmed these differences and showed that the lower strength of recyclable alternatives is not a limitation for unstressed automotive interior parts, where they can fully replace conventional CFRP.