Knotted carbon nanotube fibers and its interfacial properties with epoxy resin.

Due to the excellent mechanical properties and interface effect of carbon nanotube (CNT) fiber, it is considered to be the high strength fiber in the next generation. The structure- activity relationship between the surface morphology and mechanical properties of carbon nano- tube fibers and the boundary between fiber and epoxy resin were studied. The mechanical properties of CNT fibers with oriented structure and twist structure were analyzed by structural design. Knot method is used to design the knotted fiber, and the influence of kink on the mechanical properties of fibers was analyzed. The strengthening mechanism of kinks on the interfacial bonding between fiber and epoxy resin was discussed by microdrop embedding method. The results show that the mechanical properties of aligned CNT fibers are better than those of twisted CNTs, and the tensile strength of the fiber decreases after knotting. In the aspect of interfacial bonding properties, the interfacial shear strength between fiber and epoxy resin increases from 15 MPa to 35 MPa due to the increase of contact area and surface roughness between CNT fiber and epoxy resin. [ABSTRACT FROM AUTHOR]