Journal of Industrial and Engineering Chemistry, Vol.100, 364-371, August, 2021
Nylon 6,6 composites with carbon fiber covalently bonded to functionalized carbon nanotubes fabricated by reactive extrusion
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To produce nylon 6,6 (N66)-based composites with carbon fiber (CF) having extremely high mechanical strength, CF covalently bonded with carbon nanotube (CNT), CF-c-CNT, was
first produced by reacting functionalized CF and CNT and then a composite of N66 and CF-c-CNT was produced by melt extrusion. Two types of CF-c-CNT were prepared: CF and CNT functionalized with acyl chloride (COCl) and amine group (NH2), respectively (COCl-CF-c-CNT.NH2), and CF and CNT functionalized with NH2 and COCl, respectively (NH2-CF-c-CNT-COCl). N66 bonding to CF.c.CNT occurred during extrusion by the reaction of COCl with amine groups in N66. Thus, N66 bonded to CF (N66-CF-c-CNT) and N66 bonded to CNT (CF-c-CNT-N66) were formed. The N66/CF-c-CNT-N66 composite exhibited the highest interfacial adhesion, the best filler dispersion, and the greatest amount of N66 bonding to
filler among the composites tested. As a result, the N66/CF-c-CNT-N66 composite had the highest tensile strength and fatigue life among the composites. The tensile strength and fatigue life of the N66/CF-c-CNT-N66 composite were 20% higher and five times longer than those of the N66/CF composite, respectively.
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