Conductive Composites Based on Polyurethane and Nanostructured Conductive Filler of Montmorillonite/Polypyrrole for Electromagnetic Shielding Applications

Vargas, Patricia Cristine; Merlini, Claudia; Ramôa, Sílvia Daniela Araújo da Silva; Arenhart, Rafael Güntzel; Barra, Guilherme Mariz de Oliveira; Soares, Bluma G.

doi:10.1590/1980-5373-mr-2018-0014

Cited by 18 publications

(15 citation statements)

References 26 publications

(41 reference statements)

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“…The lower percolation threshold and higher electrical conductivity of PBAT/Mt-PPy composites may be associated to the layered structure of the Mt-PPy. This layered morphology results in a higher aspect ratio and surface area (3.52 m 2 g -1 ) 42 than found for the spherical particles of PPy (2.06 m 2 g -1 ) 42 , and consequently increases the interaction of Mt-PPy with the PBAT matrix and thus improves its ability to form a conductive network in the matrix. Similar results have been reported by Ramoa et al 35 for thermoplastic polyurethane (TPU) filled with Mt-PPy and PPy.…”

Section: Resultsmentioning

confidence: 89%

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

et al. 2019

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A novel pressure sensing material composed of poly (butylene adipate-co-terephthalate) (PBAT) and montmorillonite-polypyrrole (Mt-PPy) was prepared using melt mixing and injection molding. The structure and properties of the PBAT/Mt-PPy composites were evaluated and compared with those of the PBAT/PPy blends. The PBAT/Mt-PPy displays a very sharp insulator-conductor transition and its percolation threshold was reached at 6.5 wt% of Mt-PPy, which was lower than that for PBAT/ PPy (11.0 wt% of PPy). The transmission electron microscopy analysis shows that Mt-PPy displays a high aspect ratio and was better distributed and dispersed into PBAT compared to PPy. PBAT/Mt-PPy exhibits a decrease in the electrical resistivity with an applied compressive stress due to the formation of new conducting pathways. The electromechanical response was dependent on Mt-PPy and the maximum sensitivity was observed for the composite containing 10 wt% of Mt-PPy. In this system, the electrical resistivity drops from 9 x 10 6 to 2 x 10 6 Ω cm when a compressive stress of 0.25 MPa was applied. The electrical resistivity changes with applied compressive stress, the reproducibility and the reversibility makes PBAT/Mt-PPy a suitable material for the development of pressure sensors.

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Section: Resultsmentioning

confidence: 89%

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

et al. 2019

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“…The Mt/PPy.DBSA is a nanoadditive, which presents a layered structure with nanometric thickness. When the Py is synthetized among Mt layers, a partial exfoliation occurs, and the PPy particles stand among the layers (micrograph shown in Figure 2), resulting in an additive with higher surface area (3.52 m 2 g −1 ) (Vargas et al, 2018), if compared to the neat PPy, without the presence of the clay (2.06 m 2 g −1 ) (Vargas et al, 2018). The large surface area of Mt-PPy.DBSA provides a better dispersion and interaction with the PVDF matrix, however resulting in greater restriction of the polymer chains mobility.…”

Section: Resultsmentioning

confidence: 99%

“…In order to investigate the contribution of reflection and absorption to the total EMI SE of the composites, Transmittance (T) and Reflectance (R) powers were calculated through the scattering parameters. That represent the reflection S 11 (S 22 ) and transmission S 12 (S 21 ) coefficients, from the vector network analyzer, as described by Equations (3) and (4) (Al-Saleh et al, 2011;Ramoa et al, 2013Ramoa et al, , 2018Vargas et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…Herewith, the total EMI average, absorption loss (SE A ) and reflection loss (SE R ) were calculated on the basis of transmittance (T) and reflectance (R) coefficients, according to Equations (6-8) (Al-Saleh et al, 2011;Ramoa et al, 2013Ramoa et al, , 2018Vargas et al, 2018). Figure 7 shows the EMI SE of investigated electrospun mats and dense membranes as a function of weight fraction of Mt-PPy.DBSA filler, over the frequency range of 8.2-12.4 GHz.…”

Section: Resultsmentioning

confidence: 99%

“…Among possible applications of electrically conductive polymer composites containing nanostructured conductive filler, studies in the literature (da Silva Ramôa, 2015;Vargas et al, 2018) have demonstrated the potential for electromagnetic shielding applications (Ramoa et al, 2018). Nowadays, due to the increasing usability of electronic devices in commercial and military setting, electromagnetic interference has become a serious environmental problem (Idris et al, 2015;Liu et al, 2015;Ni et al, 2015;Ramoa et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of the Structure and Properties of Poly(Vinylidene Fluoride)/Montmorillonite-Polypyrrole Nanocomposites Prepared by Electrospinning and Solution Casting

et al. 2019

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In this work, non-woven mats of poly(vinylidene fluoride; PVDF) containing different weight fractions (2.5, 5, 10, and 12.5 wt%) of a nanostructured conductive additive based on montmorillonite-dodecylbenzenesulfonic acid-doped polypyrrole (Mt-PPy.DBSA) have been prepared by electrospinning. The effect of Mt-PPy.DBSA content on the properties of PVDF solution, mats morphology, thermo-mechanical, and electrical properties was investigated. Polymorphism of PVDF/Mt-PPy.DBSA mats was investigated by Fourier Transform Infrared (FTIR) spectroscopy. Moreover, the electromagnetic interference shielding effectiveness (EMI SE) and EMI attenuation mechanism was investigated. In order to perform a comparative study, nanocomposites with the same weight fraction of Mt-PPy.DBSA was also prepared by solution casting. The PVDF/Mt-PPy.DBSA mats display fibers with smaller diameters than neat PVDF, due to the increment in the ionic conductivity of the solution. The incorporation of the Mt-PPy.DBSA additive slightly improved electrical conductivity of the mats and they behave like as an electrically insulating material (10 −14 S cm −1), due to their porosity, that prevents the formation of a conducting network. Furthermore, the EMI SE of electrospun mats is practically null, indicating that they are almost transparent to magnetic waves. On the other hand, nanocomposites fabricated by solution casting display superior electrical conductivity (10 −2 S cm −1) and EMI SE reached values of −5 dB.

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Polyurethane (PU) based multifunctional materials: Emerging paradigm for functional textiles, smart, and biomedical applications

Sikdar

Dip

Dhar

et al. 2022

J of Applied Polymer Sci

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The advances in polymer chemistry research have revolutionized the field of smart materials and biomedical. Polyurethanes (PUs) are a versatile polymer class with diverse structure, morphology, and behavior under various conditions deemed suitable for many functional and intelligent responses. Owing to their biocompatibility, biodegradability, excellent mechanical strength, tailorable chemical, and physical forms, PU has drawn significant research attention in recent times for a wide range of applications. Herein, this review paper outlines PU's recent advances in specific applications encompassing functional textiles, intelligent functionality and medical usage. This article contains a comprehensive review of recent developments and research works concerning PU's direct involvement as coatings, 3D objects, or composite parts to add novel purpose to the textile substrates, smart objects, or medical applications.Commencing with PU's application for the waterproof breathable textiles, the review further explores recent research where PU was incorporated as a phase change material and protective clothing. This review further delves innovative functionalities and responsiveness of the polymer triggered by various stimuli.It ends with an inclusive review of PU's different forms of application concerning medical devices and activities. Finally, perspectives on future challenges and new research opportunities are also presented and discussed.

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Conductive Composites Based on Polyurethane and Nanostructured Conductive Filler of Montmorillonite/Polypyrrole for Electromagnetic Shielding Applications

Cited by 18 publications

References 26 publications

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

Comparative Study of the Structure and Properties of Poly(Vinylidene Fluoride)/Montmorillonite-Polypyrrole Nanocomposites Prepared by Electrospinning and Solution Casting

Polyurethane (PU) based multifunctional materials: Emerging paradigm for functional textiles, smart, and biomedical applications

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