Christine Arlt

Nanoscaled Boehmites’ Modes of Action in a Polymer and its Carbon Fiber Reinforced Plastic

Laminates of carbon fiber reinforced plastic (CFRP), which are manufactured by injection technology, are reinforced with boehmite particles. This doping strengthens the laminates, whose original properties are weaker than those of prepregs. Besides the shear strength, compression strength and the damage tolerance, the mode of action of the nanoparticles in resin and in CFRP is also analyzed. It thereby reveals that the hydroxyl groups and even more a taurine modification of the boehmites’ surface alter the elementary polymer morphology. Consequently a new flow and reaction comportment, lower glass transition temperatures and shrinkage, as well as a changed mechanical behavior occur. Due to a structural upgrading of the matrix (higher shear stiffness, reduced residual stress), a better fiber-matrix adhesion, and differing crack paths, the boehmite nanoparticles move the degradation barrier of the material to higher loadings, thus resulting in considerably upgraded new CFRP.

Bessere Eigenschaften von CFK durch Integration keramischer Füller

Hohere Eigenspannungen von im Injektionsverfahren hergestellten kohlenstofffaserverstarkten Verbundkunststoffen (CFK) bringen, verglichen mit Kennwerten, die mittels Prepreg-Verfahren erzielt werden, in puncto Druckkennwerte Defizite mit sich. Diese gehen in erster Linie auf geringere Steifigkeiten sowie eine erhohte Schwindung der CF-Laminate zuruck. Durch Zugabe von Nanopartikeln zu dem Epoxidharz konnen hier Verbesserungen der mechanischen sowie thermischen Kennwerte erzielt werden.