Mechanical characterization of multiwalled carbon nanotubes-polycarbonate composites

Jindal, Prashant; Goyal, Meenakshi; Kumar, Navin

doi:10.1016/j.matdes.2013.08.100

Cited by 43 publications

(23 citation statements)

References 19 publications

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“…Thus, MWCNTs make strong mechanical interlockings and create obstacles to the shear band motion. As a result, the FS and FM of the composites were increased by the addition of MWCNTs to the epoxy . One of the important factors in the improvement of flexural properties is the dispersion of MWCNTs in the epoxy.…”

Section: Resultsmentioning

confidence: 99%

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Effects of variation of steric repulsion between multiwall carbon nanotubes and anionic surfactant in epoxy nanocomposites

Sumdani

Islam

Yahaya

2018

J of Applied Polymer Sci

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The aim of this research is to investigate the effects of the variation of the steric repulsion force among multiwalled carbon nanotubes (MWCNTs) while dispersed in epoxy. Different amounts (0.25, 0.5, and 0.75 wt %) of MWCNTs were used to prepare nanocomposites in the presence of an anionic surfactant, linear alkyl benzene sulfonic acid (LABSA), to examine the effect of loading MWCNTs into the epoxy composites. The mechanical properties of the nanocomposites were analyzed by tensile, flexural, and impact testing. The structural and crystalline properties were evaluated by Fourier transform infrared spectroscopy and X‐ray diffraction analysis. The thermal properties were assessed by thermogravimetric analysis and differential scanning calorimetry, whereas dispersion and surface morphology were examined by scanning electron microscopy. It was observed that MWCNTs enhanced the tensile strength (TS) and flexural strength (FS) of the composites. The TS and FS of the composites were improved by 75.0% and 91.6%, respectively, with the inclusion of 0.50 wt % MWCNTs. The thermal properties of the composites were enhanced significantly with the addition of MWCNTs. LABSA improved the steric repulsion of MWCNTs as a consequence of homogeneous dispersion in the composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46883.

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Section: Resultsmentioning

confidence: 99%

“…As a result, the FS and FM of the composites were increased by the addition of MWCNTs to the epoxy. 28 One of the important factors in the improvement of flexural properties is the dispersion of MWCNTs in the epoxy. The distance between tubes in the interspaces was increased as a consequence of the better dispersion of the MWCNTs.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effects of variation of steric repulsion between multiwall carbon nanotubes and anionic surfactant in epoxy nanocomposites

Sumdani

Islam

Yahaya

2018

J of Applied Polymer Sci

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“…PC composites have attracted much interest lately to improve known PC weaknesses such as flame retardance, chemical resistance, and abrasion resistance . CNTs are well known to be an excellent reinforcing material . It is also electrically conductive, and for this reason, incorporation of CNTs with electrically insulating polymers creates composites with dramatically altered electrical characteristics .…”

Section: Introductionmentioning

confidence: 99%

“…The melt mixing using a micro single screw extruder showed that a single processing cycle was insufficient to obtain homogeneous composites, and hence, no benefit in reinforcing characteristics was observed . With intense melt mixing, composite mechanical properties within the range of percolation threshold were reported to be unchanged, enhanced, or reduced . The reinforcing behaviours are understood to be a result from the breakup of CNTs agglomerates, while the decline in the mechanical properties might be due to decreased homogeneity of the composites.…”

Section: Introductionmentioning

confidence: 99%

Properties characterisation of polycarbonate and multi‐walled carbon nanotubes composites prepared by solution technique

Thaithae¹,

Antonio

Wattanachai

2015

Asia-Pacific J Chem Eng

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Polycarbonate (PC) and multi-walled carbon nanotubes (MWNTs) composites were prepared by solution method where 0-20% w/w MWNTs were added into two types of PC solutions, i.e. a low and a high molecular weight solution. The composites were processed into plastic sheets using a compression moulding technique in order to study their mechanical, electrical, physical, and rheological properties. The results showed that addition of MWNTs at 1% w/w enhanced the tensile strength and modulus by up to 23 and 75%, respectively, and reduced their electrical resistivity significantly from being an insulator (1 × 10 16 À 1 × 10 17 Ω-cm) to a semi-conductor (8 × 10 8 Ω-cm), indicating a percolation threshold. A slight improvement in the mechanical properties was observed at up to 4% w/w MWNTs; however, the volume resistivity remained unchanged. As the amount of MWNTs increased >4% w/w, the mechanical properties drastically deteriorated because of the MWNTs agglomerating and segregating onto the surfaces. The segregation of the agglomerates was also supported by the surface resistivity and shear viscosity results, which decreased as MWNTs increased. MWNTs were found to interact better with the low molecular weight PC matrix and produced more homogeneous composites. The studies of composite colour and MWNTs dispersion confirmed the findings of both mechanical and electrical properties. This research demonstrates the possibility of preparation of PC and MWNTs composites at high MWNTs concentrations, which can be very useful for a master batch process.

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“…Keeping this in view, an investigation had been recently carried out by us [9] using Split Hokinson Pressure Bar to determine impact characteristics of MWCNT-PC composites. This work was followed up to measure their characteristics under static conditions by measuring the hardness and elastic constants of increasing MWCNT component in PC-MWCNT composites using nano-indenter [10]. As the results of these experiments were found to be highly motivating to assess the significance of the composites, we considered it worthwhile to suggest a simple basic model, especially for static properties in the first instance.…”

Section: Introductionmentioning

confidence: 99%

Modeling Composites of Multi-Walled Carbon Nanotubes in Polycarbonate

Jindal

Goyal

Kumar

2013

International Journal for Computational Methods in Engineering

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High strain rate experiments performed on multi-walled carbon nanotubes -polycarbonate composites (MWCNT-PC) have exhibited enhanced impact resistance under a dynamic strain rate of nearly 2500/s with composition of only 0.5 to 2.0% Multi walled carbon nanotubes(MWCNTs) in pure polycarbonate(PC). Similarly, hardness and elastic modulus under static loads resulted in significant increase depending upon the composition of MWCNTs in PC. The present work aims to analyze these results by correlating the data to fit expressions in generalizing the behavior of MWCNTs composition for MWCNT-PC composites under both static and impact loads. As a result we found that an optimum composition of 2.1 weight % of MWCNTs exhibits maximum stress resistance within elastic range under strain rates of nearly 2500/s for MWCNT-PC composites. The results are critically dependent on the composition of MWCNTs. Theses results significantly deteriorate below and above a threshold composition. Further, a simple model based on Lennard -Jones 6-12 atom-atom based potential is formulated and used to compute static properties of pure as well as composite PC.

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Mechanical characterization of multiwalled carbon nanotubes-polycarbonate composites

Cited by 43 publications

References 19 publications

Effects of variation of steric repulsion between multiwall carbon nanotubes and anionic surfactant in epoxy nanocomposites

Effects of variation of steric repulsion between multiwall carbon nanotubes and anionic surfactant in epoxy nanocomposites

Properties characterisation of polycarbonate and multi‐walled carbon nanotubes composites prepared by solution technique

Modeling Composites of Multi-Walled Carbon Nanotubes in Polycarbonate

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