Abstract
To increase the strength of carbon nanotube (CNT) fibers (CNTFs), the mean size of voids between bundles of CNTs was reduced by wet-pressing, and the CNTs were cross-linked. Separate and simultaneous physical (roller pressing) and chemical methods (cross-linking) were tested to confirm each method’s effects on the CNTF strength. By reducing the fraction of pores, roller pressing decreased the cross-sectional area from 160 μm2 to 66 μm2 and increased the average load-at-break from 2.83 ± 0.25 cN to 4.41 ± 0.16 cN. Simultaneous injection of crosslinker and roller pressing augmented the cross-linking effect by increasing the infiltration of the crosslinker solution into the CNTF, so the specific strength increased from 0.40 ± 0.05 N/tex to 0.67 ± 0.04 N/tex. To increase the strength by cross-linking, it was necessary that the size of the pores inside the CNTF were reduced, and the infiltration of the solution was increased. These results suggest that combined physical and chemical treatment is effective to increase the strength of CNTFs.
Highlights
Carbon nanotube fibers (CNTFs) can be used as 1-dimensional reinforcements of composite materials and could be the generation of carbon fibers (CFs), which are already used as commercialized reinforcements [1]
Pressed and CL: CNTFs were passed through the nip rollers while acidacid dichloride (AAD) crosslinker was dropped on them at 0.6 mL/min, the fibers were heated in an Ar atmosphere for 1 h at 160 ◦ C to induce the covalent cross-linking between carbon nanotube (CNT)
The strength of a CNTF can be increased by introducing covalent bonds among CNTs in the CNTF
Summary
Carbon nanotube fibers (CNTFs) can be used as 1-dimensional reinforcements of composite materials and could be the generation of carbon fibers (CFs), which are already used as commercialized reinforcements [1]. Methods include cross-linking using diazonium salt [20,21,22], radical reactions [23,24,25], [2+1]. Include cross-linking using diazonium salt [20,21,22], radical reactions [23,24,25], [2+1] cycloaddition [26], cycloaddition [26], esterification [27], and plasma treatment [28]. The covalent bonds between CNTs (cross-linked CNTs) strengthened CNTFs, in addition to the vdW force. The maximization of the strength of CNTs requires a combination of both physical removal of pores and chemical cross-linking. CNTFs were roller pressed while the crosslinker solution was injected (wet-pressing) and the Friedel–Craft acylation reaction was used to cross-link theinjected. Solvent infiltration: (up) no pressing, and (down) while pressing; and (c) cross-linking reaction
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