Property improvement of CNT spun yarns and their composites through pressing, stretching and tensioning

Tran Huu Nam, Ken Goto, Yoshinobu Shimamura, Yoku Inoue, Shinji Ogihara

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Untwisted multi-walled carbon nanotube (CNT) yarn was spun from vertically aligned CNT arrays by solid-state drawing CNT webs through a ceramic die. CNT yarn-reinforced epoxy composites were developed using a resin drop method. Waviness and poor packing of CNTs in the untwisted spun yarns have limited the mechanical properties of the yarns and their composites. Therefore, pressing along with sliding was applied to create thin-twisted yarns with dense packing of the CNTs. Besides, stretching and tensioning techniques were applied to the twisted yarns to reduce twist angle as well as waviness of the CNTs and their bundles. Stretching and tensioning of the press-slid yarns under constant loads of 0.15, 0.25, 0.35 N enhanced the mechanical properties of the yarns significantly. Moreover, stretching and tensioning of the press-slid CNT yarns increased the mechanical properties of the yarn composites considerably. However, tensioning of the press-slid yarns is more effective than their stretching.

Original languageEnglish
Pages (from-to)507-524
Number of pages18
JournalAdvanced Composite Materials
Volume28
Issue number5
DOIs
Publication statusPublished - 2019

Keywords

  • Carbon nanotube
  • mechanical properties
  • nano composites
  • spun yarn

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