Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 29-35.doi: 10.13475/j.fzxb.20210506707

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of polyurethane-based carbon nanotube/liquid metal conductive fibers

XUE Chao1,2, ZHU Hao1,2, YANG Xiaochuan1,2, REN Yu1,2, LIU Wanwan1,2()   

  1. 1. National & Local Joint Engineering Research Center of Technical Fiber Composites for Safety and Protection, Nantong University, Nantong, Jiangsu 226019, China
    2. School of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
  • Received:2021-05-25 Revised:2022-03-29 Online:2022-07-15 Published:2022-07-29
  • Contact: LIU Wanwan E-mail:liuww@ntu.edu.cn

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Abstract:

In order to improve the elastic properties of carbon nanotubes as conductive fillers, carbon nanotubes (CNT) and liquid metal (LM) were used as conductive fillers, thermoplastic polyurethane (TPU) was used as matrix, N, N-dimethylformamide was used as solvent, and deionized water was used as coagulation bath to produce the CNT/LM/TPU conductive fibers through the wet spinning process. The effects of LM and CNT on the structure and properties of fibers were studied. The results show that when the conductive filler content is 40% for LM and 10% for CNT, the mechanical properties of CNT/LM/TPU fiber were greatly improved with the fracture stress reaching 10.16 MPa and the elongation at break 252%. The CNT/LM/TPU fiber has good electrical conductivity, which is 5.41 S/m. Circuit experiments show that the fiber can be used as a wire lighting circuit, and the circuit can still have current through under the strain levels of 100% and 200%. CNT/LM/TPU fiber has excellent recovery performance, and it still has stable resistance recovery after 20 repeated tensile loading. In addition, the fiber also had good antibacterial properties, and the antibacterial rate against Staphylococcus aureus reaches 92.61%.

Key words: carbon nanotube, liquid metal, thermoplastic polyurethane, conductive fiber, wet spinning

CLC Number: 

  • TQ190.8

Tab.1

Spinning solution formula%"

样品编号 TPU质量分数 CNT质量分数 LM质量分数
1# 100 — —
2# 95 5 —
3# 90 10 —
4# 60 — 40
5# 55 5 40
6# 50 10 40

Fig.1

SEM images of TPU,CNT/TPU and CNT/LM/TPU fiber"

Fig.2

Cross-section SEM image (a) and EDS images (Ga(b),In(c),Sn(d)) of 6# fiber"

Fig.3

Energy spectrum analysis results of 6# fiber"

Fig.4

Stress-strain tensile curve"

Tab.2

Conductivity of different fiber samples"

样品编号 电导率/(S·m-1)
1# —
2# 6.4×10-2
3# 1.59
4# —
5# 2.96
6# 5.41

Fig.5

Circuit test result of CNT/LM/TPU fiber as conductor.(a) Lamp brightness before and after twisted;(b) Lamp brightness before and after stretching"

Fig.6

Conductive model of fiber tensile process.(a) Before stretching; (b) During stretching; (c) After stretching"

Fig.7

Changes of relative resistance of sample 6# under different strain stretching. (a)10% strain; (b)30% strain; (c)50% strain; (d)100% strain"

Tab.3

Antibacterial rate of different fiber samples"

样品编号 空白对照样24 h
活菌浓度/个		 抗菌试样24 h
活菌浓度/个		 抑菌率/%
3# 213×104 132×104 38.03
6# 203×104 15×104 92.61
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