Investigation of MWCNT Reinforcement on the Strain Hardening Behavior of Ultrahigh Molecular Weight Polyethylene

Mahfuz, Hassan; Khan, Mujibur R.; Leventouri, Th.; Liarokapis, E.

doi:10.1155/2011/637395

Cited by 25 publications

(16 citation statements)

References 37 publications

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“…Amongst all the loadings, a 0.5% loading has the minimal impact on the mechanical properties. Similar phenomenon have been observed during CNT inclusion in polyethylene-based polymer systems [34,35] where 2 wt. % of CNT loading was found to be effective.…”

Section: Tensile Testingsupporting

confidence: 81%

Investigation of Mechanical Properties and Morphology of Multi-Walled Carbon Nanotubes Reinforced Cellulose Acetate Fibers

Sultana

Hasan

Iqbal

et al. 2017

Fibers

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Cellulose acetate (CA) fibers were reinforced with multi-walled carbon nanotubes (MWCNTs) at 0.5%, 1.0%, 1.5% and 2.0%. Yield strength, ultimate tensile strength, fracture strain and toughness of the nanocomposite fiber increased up to 1.5 wt. % of the carbon nanotube (CNT) loading, however, further inclusion (2.0%) of MWCNTs in CA decreased the mechanical properties. Experimental properties were also compared with analytical predictions using a Shear lag model for strength and the rule of mixture for modulus. A solution spinning process, coupled with sonication, mixing, and extrusion, was used to process the CNT-reinforced composite fiber. Scanning electron microscopy (SEM) images of the cross sections of neat CA and CA-MWCNT fibers showed the formation of voids and irregular features. The enhanced interconnected fibrillation in the CNT-reinforced CA samples resulted in improved mechanical properties, which were observed by tensile testing. Fourier transform infrared spectroscopy (FTIR) spectra showed the area under the curve for C-H bonding after the inclusion of CNT. There was no significant shift of wavenumber for the inclusion of MWCNT in the CA matrix, which indicates that the sonication process of the CNT-loaded solution did not degrade the CA bonding structure.

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Section: Tensile Testingsupporting

confidence: 81%

Investigation of Mechanical Properties and Morphology of Multi-Walled Carbon Nanotubes Reinforced Cellulose Acetate Fibers

Sultana

Hasan

Iqbal

et al. 2017

Fibers

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“…In several reports, mechanical properties such as fracture toughness, tensile strength, and elastic modulus of polymer‐based fibers have shown to increase with the addition of carbon nanotubes . These improvements are commonly attributed to effective interfacial adhesion and stress transfer between CNT and the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of UHMWPE nanocomposite fibers containing carbon nanotubes coated with a PVP surfactant layer

Hulsey¹,

Absar²,

Sultana³

et al. 2017

Polymer Composites

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Ultra‐high‐molecular‐weight polyethylene (UHMWPE) nanocomposite fibers were fabricated using solution spinning, consisting of surface modified single‐walled carbon nanotubes (SWCNTs) embedded into the fiber matrix. The SWCNTs were modified using polyvinylpyrrolidone (PVP) noncovalent functionalization process, which acts as a surfactant and has the ability to enhance the dispersion of CNTs in the base polymer matrix by reducing aggregation and promoting interfacial adhesion with the fiber polymer matrix. Tensile testing of fibers containing PVP‐coated SWCNTs showed substantial improvements in the tensile strength and fracture strain by 125% and 137%, respectively, compared to fibers containing pristine CNTs. The amount of PVP coated onto the surfaces of CNTs was determined to be about 32.5% using thermogravimetric analysis (TGA). Differential scanning calorimetry (DSC) analysis of the nanocomposite fibers showed significant increase in crystallinity and upshift in the melting point compared to that of neat UHMWPE fibers. Fourier transform infrared spectroscopy (FTIR) analysis showed the presence of characteristic absorbance bands of PVP functional groups (CN @ 1289 cm−1 and CO @ 1651 cm−1) on the modified CNTs. Scanning electron microscopy (SEM) imaging of modified CNTs and nanocomposite fibers showed an increase in average tube diameter and reduced aggregate formation compared to pristine CNTs, indicating the successful coating of the nanotubes with PVP. Preferential alignment of the modified CNTs along the direction of fiber extrusion and crack bridging of the fiber by nanotubes were also observed. POLYM. COMPOS., 39:E1025–E1033, 2018. © 2017 Society of Plastics Engineers

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“…In studies where the MWCNT dispersion was more effective with respect to mechanical properties, the Young's modulus generally increases linearly with the MWCNT concentration and the elongation at break and ultimate tensile strength decrease in a nonlinear way . Mahfuz et al found that a more efficient distribution of the MWCNT from solution spinning of UHMWPE filaments with MWCNT leads to an increase in Young's modulus and ultimate tensile strength, with still decreased elongation at break . Reduced elongation at break and tensile strength at break are most likely strongly affected by interaction of the MWCNT with the matrix and the MWCNT agglomerates that are already present in the decorated powder (stress concentration).…”

Section: Resultsmentioning

confidence: 99%

Porous UHMWPE Membranes and Composites Filled with Carbon Nanotubes: Permeability, Mechanical, and Electrical Properties

Otto

Handge

Georgopanos

et al. 2016

Macro Materials & Eng

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Application of electric fields as a mechanism against membrane fouling is an emerging cleaning process for membranes. Sintering of ultrahigh molecular weight polyethylene powder particles decorated with multiwalled carbon nanotubes (MWCNT) is performed to produce electrically conductive porous filtration membranes. The contact of the molten particle surfaces leads to their fusion through neck formation during sintering. As the MWCNT only cover the surface of the powder particles, they form a conductive network with a high number of inter‐MWCNT contacts in pathways through the polymer matrix. Membranes with an electrical conductivity of 0.9 S m−1 at a MWCNT concentration of 5.0 wt% are prepared. Additionally, a comparison of sintered and compression molded samples shows that after the heating interval, crystallization during cooling strongly influences the formation of the MWCNT network. The study reveals that electrically conductive, porous polymer membranes for microfiltration applications can be prepared using a solvent‐free process.

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Investigation of MWCNT Reinforcement on the Strain Hardening Behavior of Ultrahigh Molecular Weight Polyethylene

Cited by 25 publications

References 37 publications

Investigation of Mechanical Properties and Morphology of Multi-Walled Carbon Nanotubes Reinforced Cellulose Acetate Fibers

Investigation of Mechanical Properties and Morphology of Multi-Walled Carbon Nanotubes Reinforced Cellulose Acetate Fibers

Synthesis and characterization of UHMWPE nanocomposite fibers containing carbon nanotubes coated with a PVP surfactant layer

Porous UHMWPE Membranes and Composites Filled with Carbon Nanotubes: Permeability, Mechanical, and Electrical Properties

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