High strain rate behavior of multi-walled carbon nanotubes–polycarbonate composites

Jindal, Prashant; Pande, Shailaja; Sharma, Prince; Mangla, Vikas; Chaudhury, Anisha; Patel, Deepak; Singh, Bhanu Pratap; Mathur, R.B.; Goyal, Meenakshi

doi:10.1016/j.compositesb.2012.06.018

Cited by 69 publications

(45 citation statements)

References 13 publications

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“…8 a-MWCNT were reuxed with 60% (v/v) nitric acid (HNO 3) for 35 h to obtain acid-functionalized MWCNTs (f-MWCNT). 16,26 The treated material was washed several times with distilled water till washings were neutral to pH paper and dried in an oven at 100 C for 12 h before use.…”

Section: Synthesis and Functionalization Of Mwcntsmentioning

confidence: 99%

“…16 MWCNT were rst ultrasonically dispersed in tetrahydrofuran (THF) for 2 h to obtain a stable suspension of CNTs in THF. The suspensions were then mixed with solutions of PC in THF to obtain a series of mixtures of MWCNT/PC containing different weight percent (wt%) of MWCNT varying from about 0.1 to 23 wt% of a-MWCNT and about 0.1 to 5 wt% of f-MWCNT in PC.…”

Section: Fabrication Of Mwcnt/pc Compositesmentioning

confidence: 99%

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

Pande¹,

Chaudhary²,

Patel³

et al. 2014

RSC Adv.

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166

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Home-made multiwall carbon nanotubes (MWCNTs) were used as a reinforcing conducting filler for a thermoplastic polymer, polycarbonate (PC) and the mechanical and electrical properties of the composites were investigated for electrostatic discharge (ESD) and electromagnetic interference (EMI) shielding applications. A uniformly dispersed MWCNT/PC composite system was fabricated using solvent casting and a combination of solvent casting and compression molding techniques. The effect of MWCNTs on the failure mechanism of the polymer under tensile loading showed a ductile to brittle transition with increasing amount of carbon nanotubes. ESD studies showed that the composite films of 2 and 5 wt% functionalized-MWCNT/PC with respective charge decay times of 1 and 0.6 s show promise as electrostatic dissipative materials. EMI shielding effectiveness of a five-layered system ($2 mm thickness) of as-synthesized-MWCNT/PC composite films at 20 wt% loading reached 43 dB in the X-band (8.2-12.4 GHz). The primary mechanism of shielding was absorption, suggesting possible use as an EMI absorbing material. By using low pressure (contact pressure) compression molding the EMI shielding properties of bulk composites ($2 mm thickness) improved by about 14 dB at 10 wt% MWCNT loading.

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Section: Synthesis and Functionalization Of Mwcntsmentioning

confidence: 99%

Section: Fabrication Of Mwcnt/pc Compositesmentioning

confidence: 99%

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

Pande¹,

Chaudhary²,

Patel³

et al. 2014

RSC Adv.

Self Cite

166

View full text Add to dashboard Cite

show abstract

“…[3][4][5][6][7][8][9][10][11][12][13][14][15] Polycarbonate (PC) is an established engineering thermoplastic matrix which demonstrates a variety of characteristics for a wide range of applications and therefore is more appealing than other polymers due to its concomitant high mechanical properties, good dimensional stability, thermal stability, transparency, ease of processing, low cost and its thermoforming properties. [16][17][18] Prominent uses of PC are in the areas of automotive, aerospace, data storage and construction industries (mainly in dome light, sound walls and security components). Homogeneous dispersion of CNT in polymer host is a key issue for making CNT/PC composite.…”

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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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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“…To the best of our knowledge, most of the dynamic and quasi-static strength related work has been done on composite structures [4][5][6][7][8][9]. Static properties like elastic modulus, indentation pressure and fracture toughness of coatings on glass have been studied by Malzbender et al [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The waves are a measure of strains which are calibrated to find stress and strain in the specimen and in an earlier work. Impact loading using SHPB on carbon nanotube-polycarbonate composites was also studied [4].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Impact Absorption Behaviour of Glass Coated with Carbon Nanotubes

Jindal¹,

Goyal²,

Kumar³

2013

JSEMAT

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Boro-silicate glass samples were coated with chemically treated multi-walled carbon nanotubes (MWCNTs) to study the resistance offered by the coatings under the high strain rate impact. Impact testing of these glass samples was performed on Split Hopkinson Pressure Bar (SHPB), where strain rates were varied from 500/s to 3300/s. However, the comparisons were limited to samples subjected to a strain rate of 2300/s to 3000/s so that the effect of only variable deposits of coatings on the stress-strain behavior of glass can be studied. Variable deposits (0.1 mg to 0.8 mg) of MWCNTs were coated uniformly on glass samples having a disc shape with a fixed surface area (79 mm 2 ) to observe the effect of the coating on the impact absorption capacity of glass. It was observed that the small thickness of about 25 µm formed due to the fact that 0.2 mg of MWCNTs deposit spread over the surface increased the impact absorption capacity of the glass pieces by nearly 70%. However, beyond this amount when the deposit was increased to 0.4 mg, the coating thickness got doubled to nearly 49 µm and this led to a fall in absorption capacity which remained static till 0.8 mg deposit. However, even this decrease in capacity was able to absorb 30% more impact than offered by pure glass sample.

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High strain rate behavior of multi-walled carbon nanotubes–polycarbonate composites

Cited by 69 publications

References 13 publications

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

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

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

Dynamic Impact Absorption Behaviour of Glass Coated with Carbon Nanotubes

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