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- 저자 : Zichen Gao (검색결과 1 건)
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Mechanism of Synergetic Growth of Flexibility and Strength of Biomimetic Nanocomposite Fibre
Xiangyu Duan,Pan Li,Jingyu Ouyang,Zichen Gao,Jiaxin Liu,Jie Wang,Zhigang Xia,Weilin Xu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
Nanocomposites with carbon nanotubes (CNTs) can combine the stiffness and multi-functionality of carbonnanotubes with the advantages of high toughness and processability of polymers giving rise to properties different from thatof general composites. However, when the content of CNTs increases gradually, the flexibility of the composite fibre canreduce. In this paper, we propose a simple method of softening the composite fibre via dimensional helical deformation offibre inner macromolecule bundles to avoid the deterioration of fibre flexibility. The theoretical simulations were conductedto predict proper helical deformations of the single fibre to increase fibre softness, followed by practical softening of thepolyvinylidene difluoride (PVDF)/CNTs composite by tensional twisting of the single fibres. The fibres with and withouttensional twisting were tested by Fourier-transformed infrared spectroscopy, scanning electron microscopy, X-ray diffractionand mechanical drawing. Results showed the reinforcement of the PVDF/multi-walled CNTs composite fibres (tensilestrength enhanced from 4.71 to 5.19 cN/dtex) with an evident softness reduction (initial modulus increased from 16.8 to20.52 cN/dtex) as the CNTs content increased from 0 to 1.5 wt%. After the tensional twisting, the initial modulus of thecomposite fibre was reduced by 62.5 % while the fibre strength remained reinforced because biomimetic helix formationimproved the internal structure deformation ability of the fibre.
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