Direct mechanical measurement of the tensile strength and elastic modulus of multiwalled carbon nanotubes

Abstract Here, core-shell impact modifier particles (CSIMPs) and multiwalled carbon nanotubes (MWCNs) were used as reinforcing agents for improving toughness and tensile properties of epoxy resin. For this purpose, emulsion polymerization technique was exploited to fabricate poly(butyl acrylate-allyl methacrylate) core- poly(methyl methacrylate-glycidyl methacrylate) shell impact modifier particles with average particle size of 407 nm. It was revealed that using a combination of the prepared CSIMPs and MWCNTs could significantly enhance toughness and tensile properties of epoxy resin. Also, it was observed that the dominant factors in enhancing the fracture toughness of the ternary composites are crack deflection/arresting as well as enlarged plastic deformation around the growing crack tip induced by the combination of rigid and soft particles. The Response Surface Methodology (RSM) with central composite design (CCD) was utilized to study the effects of the amounts of core-shell particles and multiwalled carbon nanotubes on the toughness and tensile properties of epoxy resin. The proposed quadratic models were in accordance with the experimental results with correlation coefficient more than 98%. The optimum condition for maximum toughness, elastic modulus, and tensile strength were 3 % wt. MWCNT and 1.03 % wt. CSIMPs. The sample fabricated in optimal condition indicated toughness, elastic modulus, and tensile strength equal to 2.2 MPa. m1/2, 3014.5 MPa and 40.6 MPa, respectively.

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Effect of Functionalized MWCNTs with Surfactant and Coupling Agent on Properties of LDPE/POE Blends

Journal of Elastomers & Plastics ◽

10.1177/0095244311413439 ◽

2011 ◽

Vol 43 (6) ◽

pp. 543-558 ◽

Cited By ~ 1

Author(s):

Z. Chen ◽

S. Chen ◽

J. Zhang

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Tensile Strength ◽

Multiwalled Carbon Nanotubes ◽

Crystallization Behavior ◽

Low Density Polyethylene ◽

Favorable Effect ◽

Low Density ◽

Multiwalled Carbon ◽

Polyolefin Elastomer

The surfactant, sodium dodecylbenzenesulfonate (NaDDBS) and coupling agents, γ-aminopropyltriethoxy sliane (KH550) and isopropyl dioleic(dioctylphosphate) titanate (NDZ101) were used to treat multiwalled carbon nanotubes in this work. The effects of surface modification of multiwalled carbon nanotubes on crystallization behavior, mechanical properties, and electrical properties of low density polyethylene/polyolefin elastomer/multiwalled carbon nanotubes composites were studied. The results showed that NaDDBS, KH550, and NDZ101 had a favorable effect of improving the dispersion of multiwalled carbon nanotubes, but it cannot improve the interfacial interactionbetween multiwalled carbon nanotubes and the matrix. The improvement in dispersion favored the crystallization behavior and mechanical properties. Modified multiwalled carbon nanotubes had a better acceleration nucleation effect than raw multiwalled carbon nanotubes on low density polyethylene/polyolefin elastomer blends at low content (≤1 wt%). The tensile strength of low density polyethylene/polyolefin elastomer/multiwalled carbon nanotubes composites with modified multiwalled carbon nanotubes increased with lower multiwalled carbon nanotubes content (≤1 wt%), and KH550 and NDZ101 led low density polyethylene/polyolefin elastomer/multiwalled carbon nanotubes composites to possess a higher tensile strength than that of NaDDBS with 1 wt% content. NaDDBS, KH550, and NDZ101 had a minor influence on the dielectric properties of the composites and even caused a decrease in the dielectric loss of composites with 10 wt% multiwalled carbon nanotubes content.

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CNT Reinforced Silver Nanocomposites: Mechanical and Electrical Studies

Journal of Materials ◽

10.1155/2016/8629206 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Dinesh Kumar ◽

Sonia Nain ◽

Neena ◽

Hemant Pal ◽

Ravi Kumar

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Elastic Modulus ◽

Multiwalled Carbon Nanotubes ◽

Multiwalled Carbon ◽

Electrical Studies ◽

Silver Nanocomposites ◽

Silver Matrix ◽

Nanoindentation Hardness

Nanoindentation hardness and elastic modulus of the silver/MWCNT (multiwalled carbon nanotubes) composites, fabricated by modified wet mixing technique, are studied in the present work. CNT reinforced silver nanocomposites, fabricated by introducing 4.5 volume percentages of CNT in the silver matrix, have increased elastic modulus and approximately 50% higher hardness than pure nanosilver. It is also observed from the results that the electrical conductivity of the fabricated materials was decreased by increasing the CNTs volume %.

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Elastic modulus of multiwalled carbon nanotubes reinforced aluminium matrix nanocomposite – A theoretical approach

Computational Materials Science ◽

10.1016/j.commatsci.2011.03.032 ◽

2011 ◽

Vol 50 (8) ◽

pp. 2493-2495 ◽

Cited By ~ 30

Author(s):

K.T. Kashyap ◽

Praveennath G. Koppad ◽

K.B. Puneeth ◽

H.R. Aniruddha Ram ◽

H.M. Mallikarjuna

Keyword(s):

Carbon Nanotubes ◽

Elastic Modulus ◽

Multiwalled Carbon Nanotubes ◽

Theoretical Approach ◽

Aluminium Matrix ◽

Multiwalled Carbon ◽

Matrix Nanocomposite

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Mechanical and Electrical Properties of Epoxy Composites Modified by Functionalized Multiwalled Carbon Nanotubes

Materials ◽

10.3390/ma14123325 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3325

Author(s):

Paweł Smoleń ◽

Tomasz Czujko ◽

Zenon Komorek ◽

Dominik Grochala ◽

Anna Rutkowska ◽

...

Keyword(s):

Carbon Nanotubes ◽

Tensile Strength ◽

Electrical Properties ◽

Young’S Modulus ◽

Multiwalled Carbon Nanotubes ◽

Young's Modulus ◽

Epoxy Composites ◽

Multiwalled Carbon ◽

Mechanical And Electrical Properties ◽

Functionalized Multiwalled Carbon Nanotubes

This paper investigates the effect of multiwalled carbon nanotubes on the mechanical and electrical properties of epoxy resins and epoxy composites. The research concerns multiwalled carbon nanotubes obtained by catalytic chemical vapor deposition, subjected to purification processes and covalent functionalization by depositing functional groups on their surfaces. The study included the analysis of the change in DC resistivity, tensile strength, strain, and Young’s modulus with the addition of carbon nanotubes in the range of 0 to 2.5 wt.%. The effect of agents intended to increase the affinity of the nanomaterial to the polymer on the aforementioned properties was also investigated. The addition of functionalized multiwalled carbon nanotubes allowed us to obtain electrically conductive materials. For all materials, the percolation threshold was obtained with 1% addition of multiwalled carbon nanotubes, and filling the polymer with a higher content of carbon nanotubes increased its conductivity. The use of carbon nanotubes as polymer reinforcement allows higher values of tensile strength and a higher strain percentage to be achieved. In contrast, Young’s modulus values did not increase significantly, and higher nanofiller percentages resulted in a drastic decrease in the values of the abovementioned properties.

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