Enhancing the interfacial adhesion of carbon Fiber-Poly(benzoxazine) (PBZ) composites via electrografted Electron-Rich aromatic surface chemistries

Résumé fourni par la source

Carbon fiber reinforced polymer (CFRP) composites are essential for high-performance lightweight applications, yet traditional fiber sizings often face thermal degradation at high processing temperatures. This study investigates an approach to enhance interfacial adhesion by intercepting the cationic polymerization mechanism of poly(benzoxazine) (PBZ). This was achieved by covalently modifying the fiber surface with electron rich aromatic molecules, able to participate in the cationic polymerization mechanism. Single-filament tensile testing demonstrated that the electrochemical modification preserved the tensile strength of the fiber while significantly increasing the tensile modulus by up to 9.7%. Determination of interfacial adhesion in an epoxy (non-ionic polymerization) vs polybenzoxazine (ionic polymerization), all modified fibers showed improvements, the largest was 52% (51.3 MPa vs. 37.2 MPa for the control). SEM was consistent with strong fiber–matrix adhesion for the modified fiber samples, suggesting that the presence of designed electron rich aromatic compounds on the fiber surface is a suitable means to improve adhesion for polymers which undergo cationic polymerization.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.