A green approach to preparing hydrophobic, electrically conductive textiles based on waterborne polyurethane for electromagnetic interference shielding with low reflectivity

Dai, Mengwei; Zhai, Yadi; Zhang, Yong

doi:10.1016/j.cej.2020.127749

Cited by 80 publications

(39 citation statements)

References 69 publications

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“…The low surface resistivity of the SWCNT coated textiles (see Table 10 ) is an indication of the proper distribution of SWCNT in the coatings [ 42 ]. As observed by other authors [ 43 , 44 ], the continuous structure of fibers in textiles is favorable in forming a conductive path. Moreover, some connections between the SWCNT can be observed.…”

Section: Resultssupporting

confidence: 59%

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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Waterborne polyurethane-urea dispersions (WPUD), which are based on 100% bio-based semi-crystalline polyester polyol and isophorone diisocyanate, have been successfully synthesized and doped with single-walled carbon nanotubes (SWCNT) to obtain a finishing agent that provides textiles with multifunctional properties. The chemical structure of WPUD has been characterized by Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The thermal properties have been evaluated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical thermal analysis (DMTA). Mechanical properties have been studied by tensile stress–strain analysis. Moreover, the particle size, particle size distribution (PSD), and stability of developed waterborne dispersions have been assessed by dynamic light scattering (DLS), Z-potential, and accelerated aging tests (analytical centrifugation). Subsequently, selected fabrics have been face-coated by the WPUD using knife coating method and their properties have been assessed by measuring water contact angle (WCA), water column, fabric stiffness, and air permeability. The electrical conductivity of textiles coated with SWCNT-doped WPUD has been evaluated by EN 1149 standard. Finally, the surface morphologies of uncoated and coated fabrics have been studied by scanning electron microscopy (SEM). All of the synthesized polyurethane-ureas provide the coated substrates with remarkable water-repellency and water column, being therefore a more sustainable alternative to waterproof coatings based on fluoropolymers, such as PTFE. The additivation of the polymeric matrices with SWCNT has led to textile coatings with excellent electrical conductivity, maintaining water column properties, giving rise to multifunctional coatings that are highly demanded in protective workwear and technical textiles.

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Section: Resultssupporting

confidence: 59%

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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“…In order to verify the hydrophobic performance, contact angle (CA) measurements were carried out. As shown in Figure 7, the contact angle of EP-POSS was 125°, which is higher than those of other epoxy resins with hanging POSS groups and most resins, even PTFE(poly tetra fluoroethylene) [22][23][24][25][26] , indicating that EP-POSS has good hydrophobicity and can be used as a hydrophobic material. Protective coatings for solar panels have higher requirements for light transmittance.…”

Section: Hydrophobicity and Light Transmittance Testingmentioning

confidence: 91%

Hydrophobic Epoxy Caged Silsesquioxane Film (EP-POSS): Synthesis and Performance Characterization

Fang

Wang

Sun³

et al. 2021

Nanomaterials

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Hydrophobic films are widely used in aerospace, military weapons, high-rise building exterior glass, and non-destructive pipeline transportation due to their antifouling and self-cleaning properties. This paper details the successful preparation of hydrophobic epoxy caged sesquioxane (EP-POSS) via two steps of simple organic synthesis, along with studies on the effects of viscosity and reaction time on the reaction. Interestingly, the EP-POSS presented a large contact angle of 125°, indicating its excellent hydrophobicity. The surface micromorphology was observed via FE-SEM (field emission scanning electron microscopy), transmission electron microscopy (TEM), and atomic force microscopy (AFM), and the structural composition and elemental contents were analyzed via X-ray photoelectron spectroscopy (XPS) and energy-dispersive spectrometry (EDS). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) tests showed that EP-POSS had excellent thermal properties, and the first degradation reaction occurred at 354 °C. The mechanical performance and abrasion resistance results demonstrated that EP-POSS could be used in solar panels.

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“…(2019) Thermal conductivity of G/CNC-coated bamboo fabric reached to 0.136 W m −1 K −1 with 4 wt % CNC and 3 wt % G, whereas it was around 0.049 W m −1 K −1 for CNC-coated bamboo fabric, due to the uniform distribution of G and hydrogen interactions between bamboo and G, indicating the potential of the coated bamboo fabric as cooling textiles, conductive fabrics, and wearable electronics. Zhang and colleagues followed a different path for producing conductive textiles based on a green method, which included the dip-coating of a 70% polyester-30% cotton with an aqueous dispersion of MWCNT, graphene, and hydroxyl terminated PU (WPU) as shown in Figure 7 ( Dai et al., 2021 ). The electromagnetic interference shielding effectiveness (EMI SE) of the coated textile reached to 35 dB at the thickness of 0.35 mm with a filler amount of only 3%.…”

Section: Techniques Used For Improving Thermal Conductivitymentioning

confidence: 99%

Improving thermal conductivities of textile materials by nanohybrid approaches

2022

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A green approach to preparing hydrophobic, electrically conductive textiles based on waterborne polyurethane for electromagnetic interference shielding with low reflectivity

Cited by 80 publications

References 69 publications

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Hydrophobic Epoxy Caged Silsesquioxane Film (EP-POSS): Synthesis and Performance Characterization

Improving thermal conductivities of textile materials by nanohybrid approaches

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