Percolative polyurethane-polypyrrole-straw composites with enhanced dielectric constant and mechanical strength

Chaturvedi, Ranjan; Gupta, Ritesh Kumar; Gorhe, Nikhil Rajendra; Tyagi, Prashant

doi:10.1016/j.compositesa.2020.105810

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…Among various conducting polymer fillers, PPy has shown excellent electrical properties and focused on promising materials in view of the electrical composite perspective. Tyagi et al developed percolative polyurethane-polypyrrole-straw composites with enhanced dielectric constant and mechanical strength via vapor phase polymerization, as shown in Figure 3 [ 67 ]. It was reported that the fabricated composites showed 26% increased tensile properties and 133% enhanced dielectric constant, low dissipation factor, and 51.3% decreased water uptake, accordingly having the potential for a wide applications including sensors, actuation, energy generation, and microelectronics.…”

Section: Diverse Types Of Conductive Pu-based Nanocompositesmentioning

confidence: 99%

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Choi¹,

Shin

et al. 2022

IJMS

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The purpose of this review article is to outline the extended applications of polyurethane (PU)-based nanocomposites incorporated with conductive polymeric particles as well as to condense an outline on the chemistry and fabrication of polyurethanes (PUs). Additionally, we discuss related research trends of PU-based conducting materials for EMI shielding, sensors, coating, films, and foams, in particular those from the past 10 years. PU is generally an electrical insulator and behaves as a dielectric material. The electrical conductivity of PU is imparted by the addition of metal nanoparticles, and increases with the enhancing aspect ratio and ordering in structure, as happens in the case of conducting polymer fibrils or reduced graphene oxide (rGO). Nanocomposites with good electrical conductivity exhibit noticeable changes based on the remarkable electric properties of nanomaterials such as graphene, RGO, and multi-walled carbon nanotubes (MWCNTs). Recently, conducting polymers, including PANI, PPY, PTh, and their derivatives, have been popularly engaged as incorporated fillers into PU substrates. This review also discusses additional challenges and future-oriented perspectives combined with here-and-now practicableness.

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Section: Diverse Types Of Conductive Pu-based Nanocompositesmentioning

confidence: 99%

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Choi¹,

Shin

et al. 2022

IJMS

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“…Due to high vapor pressure, pyrrole readily turns into vapors at room temperature, saturate a confined space, and poly merize over any oxidant imbued substrate present within. [23,24] The hydrogen bonding between hydroxyl group present on cellulosic fibers of cotton and nitrogen atom in pyrrole ring ensures an improved interfacial adhesion. [25] The visual color transformation of fabric from white to dark black indicated the successful macroscopically uniform coating of PPy ( Figure S1, Supporting Information).…”

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confidence: 99%

Epoxy‐Polypyrrole‐Cotton Tertiary Composite with Electro‐Tunable Stiffness

Chaturvedi

Tyagi

2020

Macro Materials & Eng

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In this work, a tertiary epoxy composite reinforced with polypyrrole (PPy) coated cotton fabric layers exhibiting electrical voltage induced thermally tunable stiffness is reported. The thin coating of PPy over cotton fabric is accomplished via oxidative vapor phase polymerization that allows creation of an active thin layer over the fibers without affecting their mechanical properties. Six such functional layers are stacked within an epoxy matrix to prepare the composite that shows in‐plane electrical insulator behavior (volume resistivity > 109 Ω cm) but considerably reduced resistivity by an order of 103 across the cross‐sections. The presence of conductive layers enables the composite to heat via Joule's effect when an electrical voltage is applied across two ends. This causes softening of matrix near the matrix‐reinforcement interface and thereby changing composite's stiffness. On application of variable voltage, a non‐linear decrease of 91% in composite stiffness is observed (6371.2 N m−1 at 0 V to 566.4 N m−1 at 63 V). A stable and tunable mechanical performance of the composite is further demonstrated by cyclic changes in stiffness due to voltage change with recovery up to 95% of original stiffness after 14 continuous cycles.

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Tunable dielectric characteristics ofTPU/PPycomposite film and foamyfilm with low loss over a wide range of temperature

Acharya,

Swain,

Sahoo

2023

J of Applied Polymer Sci

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In the present research, thermoplastic polyurethane/polypyrrole (TPU/PPy) dielectric composites film and the lightweight foamyfilm are fabricated using the most simplified solvent casting and modified phase separation water immersion techniques, respectively. The establishment of chemical interaction and morphological investigations of the fabricated systems are analyzed by Raman spectroscopy and field emission scanning electron microscope (FESEM), respectively. Various dielectric properties, together with complex impedance, are determined over a wide range of frequencies (1 Hz–1 MHz) and temperatures (25°C–120°C). Most interestingly, above 30 Hz frequency, a significantly low value (<0.1) dielectric loss tangent (tan δ) is obtained at ambient temperature. A 90:10 foamyfilm exhibits a dielectric permittivity (ε') and tan δ of 236 and 0.05 at 50 Hz frequency, respectively. Both 90:10 film and foamyfilm systems exhibit a significantly increasing trend of ε′ as well as low tan δ with an increase in temperature over a wide range of frequencies. The thermogravimetric analysis (TGA) results of the 90:10 film and foamyfilm indicate the superior thermal stability of the 90:10 foamyfilm system. Based on the obtained low dielectric loss, the fabricated dielectric film, and foamyfilm can be employed in energy storage and high‐temperature sensing applications.

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Percolative polyurethane-polypyrrole-straw composites with enhanced dielectric constant and mechanical strength

Cited by 9 publications

References 26 publications

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Epoxy‐Polypyrrole‐Cotton Tertiary Composite with Electro‐Tunable Stiffness

Tunable dielectric characteristics ofTPU/PPycomposite film and foamyfilm with low loss over a wide range of temperature

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