CNTs‐coated TPU/ANF composite fiber with flexible conductive performance for joule heating, photothermal, and strain sensing

Abstract

Flexible and highly conductive fiber has attracted considerable attention with its massive potential in functional fabric, stretchable circuits, and wearable electronic devices. Herein, we prepared a novel secondary structure composite fiber based on aramid nanofibers (ANF)-reinforced thermoplastic polyurethane (TPU) fiber accompanied by carbon nanotube (CNT)-coated on its surface. The composite fibers' dispersibility, micromorphology, and application were systematically investigated. The TPU/ANF-0.5 wt% sample showed a robust reinforcing effect, as Young's modulus and tensile strength reached 17.2 and 20.2 MPa, respectively. Meanwhile, the conductive coating layer in the outer frame was formed via a TPU solution with 10 wt% CNT content, which gives the fiber excellent flexible electrical conductivity. Such a unique structural design enables the fiber to be closely attached to human skin and monitor human movement. In addition, this TPU/ANF@CNT composite fiber can also be used for light and electric heating. The photothermal equilibrium temperature can reach 120 C in 50 s, and the electrothermal equilibrium temperature increases to 62 C under 30 V. In summary, this secondary structure composite fiber with excellent electrical and mechanical properties might have great practical application potential in wearable electronic devices.

Tensile and heat resistance behavior of modified thermoplastic polyurethane elastomer in anisotropic neodymium‐iron‐born bonded magnet

“…28 The presence of an N-H group in urethane ( NHCOO ) is indicated by the peak at 3334 cm À1 , while the characteristic stretching of the urethane carbonyl (C O) is evident at 1727 cm À1 . 29,30 Notably, the SAG spectrum exhibits a robust peak at 912 cm À1 , corresponding to the stretching vibration of the epoxy ring. 31 According to the corresponding wavenumber as recorded in Figure 2, the modified TPU sample spectrum demonstrates the absence of the epoxy ring peak compared to pristine TPU, signifying a chain extension reaction between TPU and SAG.…”

Conductive polyacrylate coatings filled with bimetal Cu–Ni, Zn–Cu, or Zn–Ni powders and graphene nanoplatelets

“…Conductive polymer coatings are widely used in additive manufacturing, for production of printed electrically and thermally conductive elements, 1,2 adhesives for electronic packaging, 3 heating elements and thermoelectric generators, 4–7 strain and pressure sensors, 4,8,9 capacitors, 10,11 and for electromagnetic interference shielding 4,12 …”

“…There is extensive information on the use of carbon nanomaterials such as graphene and graphene nanoplatelets (GNPs), carbon nanotubes (CNTs), carbon black as fillers in polymer matrixes to obtain conductive coatings 1,2,4,5,7,15,20,21,30,31,9–12 . Graphene is a monolayer of carbon atoms tightly bound in a hexagonal honeycomb lattice about 0.34 nm thick, with a lateral size orders of magnitude greater 32 .…”

“…Coatings have adequate adhesion to the glass, and owing to their high conductivity, absence of noble metals, simplicity and cheapness of fabrication can be used for production of conductive elements on glass and other substrates. Conductive polymer coatings are widely used in additive manufacturing, for production of printed electrically and thermally conductive elements, 1,2 adhesives for electronic packaging, 3 heating elements and thermoelectric generators, [4][5][6][7] strain and pressure sensors, 4,8,9 capacitors, 10,11 and for electromagnetic interference shielding. 4,12 Non-metallic conductive coatings can be obtained using either a conductive polymer, such as polyaniline, polypyrrole, polythiophene, 10,13 or a non-conductive polymer matrix containing a filler that ensures the flow of electric current.…”

“…There is extensive information on the use of carbon nanomaterials such as graphene and graphene nanoplatelets (GNPs), carbon nanotubes (CNTs), carbon black as fillers in polymer matrixes to obtain conductive coatings. 1,2,4,5,7,15,20,21,30,31,[9][10][11][12] Graphene is a monolayer of carbon atoms tightly bound in a hexagonal honeycomb lattice about 0.34 nm thick, with a lateral size orders of magnitude greater. 32 The value of electrical conductivity of pure undoped graphene fluctuates over a very wide range of 10-2000 S/cm (specific volume resistance ρ v = 0.1-5Á10 À4 ΩÁcm), since it strongly depends on the method of preparation, the shape and size of the particles, their arrangement and environment.…”