This thesis examines the adhesion between polymer composites, with a particular focus on a thermoplastic composite based on polyphenylene sulfide (PPS), reinforced with glass fibers and mineral fillers, and a thermoset composite based on epoxy resin (EP), also reinforced with glass fibers and mineral fillers. Experimental sample series were prepared under varying injection molding parameters. Prior to overmolding with the thermoset composite, the surface of the thermoplastic composite shafts was modified through laser structuring. The prepared specimens were characterized using computed tomography (CT), leak testing (helium mass spectrometry and the immersion method with bubble detection under overpressure), and mechanical joint failure testing. To further investigate the polymer composite surfaces and the interfacial regions between the two composite systems, advanced surface analytical techniques were employed: scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and secondary ion mass spectrometry (SIMS). The findings demonstrate that adhesion quality is strongly influenced by surface pretreatment and condition, the specific combination of constituent materials, and the mineral filler content of the thermoset composite. The analyses confirmed that laser structuring enhances mechanical interlocking, thereby improving the sealing performance and the overall stability of the joints between the materials.
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