Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
Carbon nanotubes (CNTs) are nanofibers with excellent mechanical properties and low specific gravity. In recent years, spinnable CNTs have been developed that can be spun into yarns. Research has been conducted on CNT composites using spun yarns as preform. However, excellent mechanical properties of CNTs have not been fully utilized due to defects in CNT, catalysts, left inside CNTs and disorder of CNT layers. For improving the mechanical properties of CNTs, annealing at high temperatures and thinning of CNT are effective. Annealing can reduce defects in CNTs. Thinning of CNT can increase the proportion of CNT layers that support load. Therefore, both treatments can be expected to improve tensile properties. In this study, the tensile properties of CNTs were investigated for large-diameter CNTs with a diameter of 40 nm and small-diameter CNTs with a diameter of 25 nm under the condition of as-produced and annealed. As a result, it was found that the reduction in diameter move attributed to the improvement of the tensile strength of CNTs than annealing in our case.
