Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications

Pande, Shailaja; Chaudhary, Amit; Patel, Deepak; Singh, Bhanu Pratap; Mathur, R.B.

doi:10.1039/c3ra47387b

Cited by 170 publications

(86 citation statements)

References 42 publications

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“…30 Pande et al studied the EMI shielding properties of high pressured and low pressured compression molded MWCNT/PC composites in X-band. 27 They observed shielding effectiveness (SE) of about 21 dB for high pressured 10 wt% MWCNT/PC and 35 dB for low pressured 10 wt% MWCNT/PC. In addition to PC, some other engineering plastic has also been studied for EMI shielding.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and electrical properties of high performance MWCNT/polycarbonate composites prepared by an industrial viable twin screw extruder with back flow channel

et al. 2014

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a High performance multiwall carbon nanotube (MWCNT) reinforced polycarbonate (PC) composites were prepared using an industrially viable fast dispersion process by a micro twin screw extruder with back flow channel and their mechanical and electrical properties were investigated for EMI shielding applications. A uniformly dispersed MWCNT/PC composite system was observed through SEM and TEM investigations. Incorporation of a small amount of MWCNT (2 wt%) led to enhancements in the tensile strength (up to 79.6 MPa) and flexural strength (up to 110 MPa), which were equivalent to 19.6% and 14.6% increases over the neat PC. The effect of MWCNTs on the failure mechanism of the PC under tensile loading showed a ductile to brittle transition with increasing concentration of MWCNTs. The results of enhanced mechanical properties were well supported by micro Raman spectroscopic studies. In addition to the mechanical properties, significant improvement in the electrical conductivity (0.01 S cm À1 at 10 wt% MWCNT) of these composites was observed which yielded the EMI shielding of À27.2 dB in the Ku band suggesting their possible use as a high strength EMI shielding material.

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Section: Introductionmentioning

confidence: 99%

“…23 Pande et al studied composite samples (fabricated using solvent casting method) comprising CNT content up to 20 wt%. 27 They reported maximum yield stress for 2 wt% MWCNT sample (an overall improvement of 18.2% over pure PC). Further addition lead to decrease in yield stress but modulus show enhancement with addition of MWCNT.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and electrical properties of high performance MWCNT/polycarbonate composites prepared by an industrial viable twin screw extruder with back flow channel

et al. 2014

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“…2 CNTs have incredibly high mechanical, electrical [3][4][5] and thermal properties 6,7 with low density. Light-weight materials can be used for advanced technologies like aerospace components, automobiles, adaptive and smart materials as well as for military purposes.…”

Section: Introductionmentioning

confidence: 99%

Depression in glass transition temperature of multiwalled carbon nanotubes reinforced polycarbonate composites: effect of functionalization

et al. 2015

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Functionalized multiwalled carbon nanotubes (a-MWCNTs) and non-functionalized MWCNTs were melt mixed with polycarbonate polymer by utilizing twin screw micro compounder having a back flow channel to obtain nanocomposites with varying composition from 0.5 to 10 wt% MWCNT and 2 wt% a-MWCNT. Mechanical properties of composite samples were studied using dynamic mechanical analyzer, flexural and tensile tests. Both DMA and flexural and tensile tests suggest formation of continuous network of CNT-polymer that is supported by measured storage modulus for different loading of MWCNT and a-MWCNT. The composite sample showed lower glass transition temperature (T g ) as compared to pure PC. Effect of functionalization of MWCNTs on T g of its of polycarbonate composites is studied and showed higher T g depression in functionalized MWCNTs compared to non functionalized MWCNTs based composites over pure polycarbonate. In DMA, lowering of height of tan delta peak indicates that polymer in composite material participating in T g was reduced along with loading of MWCNT, consistent with immobilization of polymer material present at the CNT interface.Effect of functionalization on morphology was investigated using scanning electron microscope and confirms the better interaction in case of a-MWCNTs compare to MWCNTs based composites. Further, Raman spectroscopic analysis indicates higher interaction between a-MWCNT and PC matrix as compared to as synthesized MWCNT.

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“…[55][56][57][58][59][60][61] It was known that the uniform dispersion of the ller is one of the keys to effectively enhancing the physical properties of polymer composites.…”

Section: Mechanical Properties Of Polymer-cnt Composite Lmsmentioning

confidence: 99%

Impact of size control of graphene oxide nanosheets for enhancing electrical and mechanical properties of carbon nanotube–polymer composites

Kim

Yun

et al. 2017

RSC Adv.

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Graphene oxide (GO) has been explored for improving the dispersion stability of carbon nanotubes (CNTs).In particular, the size and shape of GO sheets have a significant impact on determining their dispersion efficiency and optimizing the properties of the CNT-based composites, but, to date, such effects have never been systematically assessed. In this study, we evaluated the size effects of GOs on the dispersion behavior of multi-walled CNTs (MWCNTs), and exploited them to develop conducting film and polymer-CNT composites with excellent electrical and mechanical properties. Synthesis of a series of five different GOs with varied sizes ranging from 170 to 2060 nm, but nearly the same surface properties, allowed systematical investigation of size effects of GO sheets. The CNT-dispersing ability of the GOs was improved significantly as the size of the sheets decreased. For example, the critical GO-to-MWCNT ratio (W GO /W MWCNT ) required to produce stable MWCNT dispersion was in proportion to the size of the GO. Furthermore, the minimum value of the W GO /W MWCNT ratio required to fabricate a conductive GO-MWCNT film underwent a dramatic decrease from 0.1 to 0.025 as the size of the GO sheets changed from 2060 to 170 nm. Small-sized GOs facilitated the formation of an interconnected MWCNT network more effectively than large-sized GOs. Further investigation of the size effects of the GO on the mechanical properties of polymer-MWCNT composites was performed by measuring the Young's modulus of the composites. A two-fold enhancement in the mechanical properties of the polymer-CNT composites was achieved by controlling the size of GO. Our results provide important guidelines for the design of carbonaceous-material-based composites with excellent electrical and mechanical properties.

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Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications

Cited by 170 publications

References 42 publications

Mechanical and electrical properties of high performance MWCNT/polycarbonate composites prepared by an industrial viable twin screw extruder with back flow channel

Mechanical and electrical properties of high performance MWCNT/polycarbonate composites prepared by an industrial viable twin screw extruder with back flow channel

Depression in glass transition temperature of multiwalled carbon nanotubes reinforced polycarbonate composites: effect of functionalization

Impact of size control of graphene oxide nanosheets for enhancing electrical and mechanical properties of carbon nanotube–polymer composites

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