Biokompozyty na osnowie biopoliamidu o obniżonej absorpcji wody i zwiększonej wytrzymałości zmęczeniowej_Grafit

Graphite enhances mechanical performance of biopolyamides. The modulus of elasticity increases by 40% for material modified with flake graphite, while expanded graphite presents a 10% increase. However, tensile strength decreases by a few percent with flake graphite and 30% with expanded graphite.

Water absorption is reduced by up to 20% due to graphite's lamellar structure. Graphite composites show increased fatigue and dynamic creep resistance, with fatigue strength increasing 30% relative to matrix material. Expanded graphite influences friction behavior under low-load conditions.

Graphite-filled composites maintain mechanical properties upon thermal aging, while neat BioPA degrades significantly. After accelerated thermal aging, unmodified material presents a 30% and 70% decrease in elastic modulus and tensile strength, while flake graphite composites shows a 20% and 15% decrease, respectively. The findings demonstrate graphite morphology's role in improving tribological properties, moisture uptake and fatigue resistance.