Tailoring the dispersion of multiwall carbon nanotubes in co-continuous PVDF/ABS blends to design materials with enhanced electromagnetic interference shielding

Kar, Goutam Prasanna; Biswas, Sourav; Rohini, Rani; Bose, Suryasarathi

doi:10.1039/c5ta01183c

Cited by 119 publications

(61 citation statements)

References 50 publications

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“…In our previous study,5 we observed similar effects where MWNTs were preferentially localized in the PVDF phase even when it was blended with the lower viscous and higher surface free energy component(ABS). The SEM micrographs, selective dissolution experiments further support the fact that MWNTs are localized in the PVDF phase.…”

supporting

confidence: 65%

“…[2][3][4][5] With the aim to circumvent sombre penalties attributable to this interference, shielding of emitted EM radiation has become prime requisite. 1 This emitted EM radiation is a novel kind of effluent, which interferes with the circuitry of nearby appliances and manifests itself as a perturbation in the operation of electronic devices, which, finally can lead to an indecorous operation or malfunction of precise equipments.…”

Section: Introductionmentioning

confidence: 99%

“…20 This route results in high electrical conductivity in the composites. 5,23 The absorption is the another factor of EM attenuation where, dielectric constant of the samples must be as close as possible to that of air, and the shield should contain electric and/or magnetic dipoles that can interact with electric (E) and magnetic (H) vector component of the oscillating incident EM radiation. 22 In this approach, the effective (local) concentration of the conduction inclusions increases thereby facilitating more interconnected network especially, with large aspect ratio particles like CNTs.…”

Section: Introductionmentioning

confidence: 99%

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Engineering nanostructured polymer blends with controlled nanoparticle location for excellent microwave absorption: a compartmentalized approach

2015

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In order to obtain better materials, control over the precise location of nanoparticles is indispensable. It is shown here that ordered arrangements of nanoparticles, possessing different characteristics (electrical/magnetic dipoles), in the blend structure can result in excellent microwave absorption. This is manifested from a high reflection loss of ca. -67 dB for the best blend structure designed here. To attenuate electromagnetic radiation, the key parameters of high electrical conductivity and large dielectric/magnetic loss are targeted here by including a conductive material [multiwall carbon nanotubes, MWNTs], ferroelectric nanostructured material with associated relaxations in the GHz frequency [barium titanate, BT] and lossy ferromagnetic nanoparticles [nickel ferrite, NF]. In this study, bi-continuous structures were designed using 50/50 (by wt) blends of polycarbonate (PC) and polyvinylidene fluoride (PVDF). The MWNTs were modified using an electron acceptor molecule, a derivative of perylenediimide, which facilitates π-π stacking with the nanotubes and stimulates efficient charge transport in the blends. The nanoscopic materials have specific affinity towards the PVDF phase. Hence, by introducing surface-active groups, an ordered arrangement can be tailored. To accomplish this, both BT and NF were first hydroxylated followed by the introduction of amine-terminal groups on the surface. The latter facilitated nucleophilic substitution reactions with PC and resulted in their precise location. In this study, we have shown for the first time that by a compartmentalized approach, superior EM attenuation can be achieved. For instance, when the nanoparticles were localized exclusively in the PVDF phase or in both the phases, the minimum reflection losses were ca. -18 dB (for the MWNT/BT mixture) and -29 dB (for the MWNT/NF mixture), and the shielding occurred primarily through reflection. Interestingly, by adopting the compartmentalized approach wherein the lossy materials were in the PC phase and the conductive materials (MWNT) were in the PVDF phase, outstanding reflection losses of ca. -57 dB (for the BT and MWNT combination) and -67 dB (for the NF and MWNT combination) were noted and the shielding occurred primarily through absorption. Thus, the approach demonstrates that nanoscopic structuring in the blends can be achieved under macroscopic processing conditions and this strategy can further be explored to design microwave absorbers.

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confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Engineering nanostructured polymer blends with controlled nanoparticle location for excellent microwave absorption: a compartmentalized approach

2015

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“…The interfacial energy or the interfacial tension between the components can be calculated from surface energy values using harmonic mean equation and geometric equation. Harmonic mean equation otherwise known as Wu's equation (Equation ) is applicable only for non‐ polar/non‐polar systems and geometric mean or Owens‐Wendt‐Rabel‐Kaelble (OWRK)(Equation ) is applicable for polar/non‐polar systems. PTT is polar and PE is non polar in nature and we have used OWRK equation to calculate interfacial energies of the present system.…”

Section: Resultsmentioning

confidence: 99%

Selective Localization of MWCNT in Poly (Trimethylene Terephthalate)/Poly Ethylene Blends: Theoretical Analysis, Morphology, and Mechanical Properties

Kunjappan

Ramachandran

Padmanabhan

et al. 2018

Macromolecular Symposia

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Theoretical analysis is carried out to predict the nature of selective localization of multi‐walled carbon nanotubes (MWCNTs) in poly(trimethylene terephthalate/polyethylene (PTT/PE) blends. In agreement with theoretical data experimental results clearly indicate that MWCNT prefers to get associated with PTT phase than with PE. Molecular interactions responsible for such selective localization of MWCNT to PTT component can be attributed to mutual and collective π–π interactions possible between the aromatic moieties present in PTT and MWCNT. In addition, the reinforcing effect of MWCNT in the PTT/PE system was determined using tensile analysis and the morphological features of blends and blend nanocomposites are studied using scanning electron microscope (SEM). Compared to the PTT/PE blend system MWCNT incorporated blend nanocomposites show better mechanical properties. The elongation at break of the blend system is seen to rise with increasing amount of PE content. Among various blend nanocomposites, we have investigated the nanocomposites with higher PTT content show higher tensile strength and Young's modulus. The blend nanocomposite with 90/10/1 composition shows 12% increment in Young's modulus and as much as 80% increment in tensile strength compared to 90/10 blend system which signifies the role MWCNT plays in the blend system.

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“…[1][2][3] Thus, considerable attentions have been devoted to the development of high-performance EMI shielding materials. [7][8][9][10][11][12][13][14][15] The common conductive nanollers are composed of carbon-based nanoparticles like carbon nanobers (CNFs), 7 carbon nanotubes (CNTs) [8][9][10] and graphene nanoplatelets, [11][12][13][14][15] and metal-based nanoparticles like stainless-steel ber, 16 Cu nanowires, 17 silver nanowires (AgNWs) 18,19 and silver nanoplates. [7][8][9][10][11][12][13][14][15] The common conductive nanollers are composed of carbon-based nanoparticles like carbon nanobers (CNFs), 7 carbon nanotubes (CNTs) [8][9][10] and graphene nanoplatelets, [11][12][13][14][15] and metal-based nanoparticles like stainless-steel ber, 16 Cu nanowires, 17 silver nanowires (AgNWs) 18,19 and silver nanoplates.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

2015

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Silver nanofillers of three different shapes were synthesized: silver nanospheres (AgNSs), silver nanowires (AgNWs) and silver nanowires-silver nanoplatelets (AgNWPs). Ultra-lightweight polyimide (PI) composite foams filled with these three silver nanofillers were fabricated by a facile and effective one-pot liquid foaming process, respectively. Their microstructure, electromagnetic interference (EMI) shielding effectiveness (SE) and shielding mechanisms were investigated. It was found that, at the same nanofiller loading, the EMI SE of the composite foams decreased in the following order: AgNWPs > AgNWs > AgNSs. AgNWPs/PI composite foams exhibited the highest EMI SE owing to the denser 3D conductive network of AgNWPs compared to AgNWs and AgNSs, in which the seamlessly interconnected AgNWPs network provided fast electron transport channels inside foams. Maximum specific EMI SE values of 1208 dB g À1 cm 3 at 200 MHz, 650 dB g À1 cm 3 at 600 MHz, and 488 dB g À1 cm 3 in the frequency ranges of 800-1500 MHz, 216-249 dB g À1 cm 3 at 8-12 GHz were achieved in the composite foams at 4.5 wt% AgNWPs loading, which far surpass the best values of other composite materials. The reflections of interconnected AgNWPs networks inside the foams combined with absorptions resulting from the multiple reflections at interfaces inside the foams contributed to the shielding effect. This suggests that our AgNWPs/PI composite foams have excellent potential as high-performance EMI shielding materials against electromagnetic interference pollution in applications that need lightweight. Fig. 7 Dispersion of silver nanostructures in composite foams for PIF-P, PIF-W and PIF-WS: (middle) FESEM images of cell walls; (left) FESEM images of the distribution of silver nanostructures in cell membranes; (right) FESEM images of the distribution of silver nanostructures in cell walls.This journal is

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Tailoring the dispersion of multiwall carbon nanotubes in co-continuous PVDF/ABS blends to design materials with enhanced electromagnetic interference shielding

Abstract: Highly conducting composites were derived by selectively localizing multiwall carbon nanotubes (MWNTs) in co-continuous PVDF/ABS (50/50, wt/wt) blends.

Cited by 119 publications

References 50 publications

Engineering nanostructured polymer blends with controlled nanoparticle location for excellent microwave absorption: a compartmentalized approach

Engineering nanostructured polymer blends with controlled nanoparticle location for excellent microwave absorption: a compartmentalized approach

Selective Localization of MWCNT in Poly (Trimethylene Terephthalate)/Poly Ethylene Blends: Theoretical Analysis, Morphology, and Mechanical Properties

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

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