Comparing the elasticity of the melt and electrical conductivity of the solid of PP-HDPE copolymer CNT composites obtained by direct compounding versus dilution of a PP masterbatch

Composites of multiwall carbon nanotubes (CNT) at 1, 2, and 3 wt.% on a polypropylene–polyethylene random copolymer matrix were prepared by melt compounding CNT powder and by dilution of a commercial polypropylene masterbatch (PMB). While the shear viscosity shows similar behavior for both dilution modes, the differences in their elastic properties clearly show the effect of the addition method and the presence of the PMB. This also indicates the relevance of having a difficult to mix masterbatch to enhance the elongational viscosity of the composites for free wall applications such as fiber spinning and blown film. On the other hand, the 2 and 3 wt.% CNT composites from both addition modes have similar electrical conductive behavior, with values near the semiconductors’ range. TEM and SEM images show different states of dispersion for each source of CNT. The immiscibility observed in those images is the simplest explanation for the differences in the molten composites’ elastic properties due to direct CNT addition versus CNT addition by dilution of a PMB.

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A strategy to achieve enhanced electromagnetic interference shielding at ultra-low concentration of multiwall carbon nanotubes in PαMSAN/PMMA blends in the presence of a random copolymer PS-r-PMMA

RSC Advances ◽

10.1039/c5ra27976c ◽

2016 ◽

Vol 6 (32) ◽

pp. 26959-26966 ◽

Cited By ~ 9

Author(s):

Suryasarathi Bose ◽

Maya Sharma ◽

Avanish Bharati ◽

Paula Moldenaers ◽

Ruth Cardinaels

Keyword(s):

Carbon Nanotubes ◽

Electromagnetic Interference ◽

Multiwall Carbon Nanotubes ◽

Random Copolymer ◽

Shielding Effectiveness ◽

Emi Shielding ◽

Electromagnetic Interference Shielding ◽

Emi Shielding Effectiveness ◽

Pmma Blends ◽

Multiwall Carbon

Mediated by the PS-r-PMMA, the MWNTs were mostly localized at the interface and bridged the PMMA droplets. This strategy led to enhance EMI shielding effectiveness at 0.25 wt% MWNTs through multiple scattering from MWNT covered droplets.

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Molecular dynamics study of the influence of functionalization on the elastic properties of single and multiwall carbon nanotubes

Computational Materials Science ◽

10.1016/j.commatsci.2011.07.003 ◽

2011 ◽

Vol 50 (12) ◽

pp. 3417-3424 ◽

Cited By ~ 29

Author(s):

Borja Coto ◽

Ibai Antia ◽

Miren Blanco ◽

Inger Martinez-de-Arenaza ◽

Emilio Meaurio ◽

...

Keyword(s):

Carbon Nanotubes ◽

Molecular Dynamics ◽

Elastic Properties ◽

Multiwall Carbon Nanotubes ◽

Multiwall Carbon

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Poly(4-methyl-1-pentene)/MWNT nanocomposites

e-Polymers ◽

10.1515/epoly.2008.8.1.922 ◽

2008 ◽

Vol 8 (1) ◽

Cited By ~ 1

Author(s):

Prashant A Patil ◽

Santosh D Wanjale ◽

Jyoti P. Jog

Keyword(s):

Storage Modulus ◽

Multiwall Carbon Nanotubes ◽

Viscoelastic Behavior ◽

Complex Viscosity ◽

Dielectric Analysis ◽

Melt Compounding ◽

Tan Δ ◽

Multiwall Carbon ◽

Thermal Stability Of ◽

Scanning Electron

AbstractNanocomposites of poly(4-methyl-1-pentene) (PMP) with various weight fractions of multiwall carbon nanotubes (MWNT’s) were prepared by melt compounding. The nanocomposites are characterized for structure using scanning electron microscopy. The viscoelastic behavior of the nanocomposites is investigated in solid as well as melt state. The study reveals a significant increase in storage modulus especially in the rubbery regime of the polymer matrix and reduced tan δ. Rheological properties in melt show that the complex viscosity and shear storage modulus are increased as a result of incorporation of MWNT. A systematic decrease in the cross over frequency is noted which is attributed to the increased relaxation time. In dielectric analysis, composition dependent enhanced permittivity and conductivity are observed. The thermal stability of the polymer is found to be significantly improved in presence of MWNT’s.

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Preparation and Properties of PP/PLA /Multiwall Carbon Nanotube Composites Filaments Obtained by Melt Compounding

Materials Science Forum ◽

10.4028/www.scientific.net/msf.620-622.465 ◽

2009 ◽

Vol 620-622 ◽

pp. 465-468 ◽

Cited By ~ 4

Author(s):

Jing Zou ◽

Ying Chen Zhang ◽

J.N. Huang ◽

Hong Yan Wu ◽

Y.P. Qiu

Keyword(s):

Multiwall Carbon Nanotubes ◽

Atmospheric Pressure Plasma ◽

Tensile Tests ◽

Multiwall Carbon Nanotube ◽

Test Results ◽

Dsc Studies ◽

Melt Compounding ◽

Nanotube Composites ◽

Moderate Change ◽

Multiwall Carbon

The present paper studied the thermal and mechanical properties of atmospheric pressure plasma jet (APPJ) treated multiwall carbon nanotubes/polypropylene/polylactic acid nanocomposite filaments. The experiments included tensile tests, differential scanning calorimeter (DSC), Scanning electron microscopy (SEM) experiments. DSC studies showed that there were a distinct shift in Tg and a relatively moderate change in Tm for different systems. The activation volumes of CNTs/PP/PLA nanocomposite filaments have been calculated to describe strain rate sensitive behavior of CNTs/PP/PLA nanocomposite filaments by following Eyring’s equation based on the tensile test results.

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Influence of Multiwall Carbon Nanotube on mechanical and wear properties of Copper – Iron composite

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.1.2020.06.0561 ◽

2020 ◽

Vol 17 (1) ◽

pp. 7570-7576 ◽

Cited By ~ 1

Author(s):

H. Sh. Hammood ◽

S. S. Irhayyim ◽

A. Y. Awad ◽

H. A. Abdulhadi

Keyword(s):

Carbon Nanotubes ◽

Volume Fraction ◽

Hybrid Composites ◽

Hydraulic Press ◽

Dry Sliding Wear ◽

Multiwall Carbon Nanotube ◽

Wear Properties ◽

Sem Images ◽

Wear Rates ◽

Multiwall Carbon

Multiwall Carbon nanotubes (MWCNTs) are frequently attractive due to their novel physical and chemical characteristics, as well as their larger aspect ratio and higher conductivity. Therefore, MWCNTs can allow tremendous possibilities for the improvement of the necessarily unique composite materials system. The present work deals with the fabrication of Cu-Fe/CNTs hybrid composites manufactured by powder metallurgy techniques. Copper powder with 10 vol. % of iron powder and different volume fractions of Multi-Wall Carbon Nanotubes (MWCNTs) were mixed to get hybrid composites. The hybrid composites were fabricated by adding 0.3, 0.6, 0.9, and 1.2 vol.% of MWCNTs to Cu- 10% Fe mixture using a mechanical mixer. The samples were compressed under a load of 700 MPa using a hydraulic press to compact the samples. Sintering was done at 900°C for 2 h at 5ºC/min heating rate. The microscopic structure was studied using a Scanning Electron Microscope (SEM). The effect of CNTs on the mechanical and wear properties, such as micro-hardness, dry sliding wear, density, and porosity were studied in detail. The wear tests were carried out at a fixed time of 20 minutes while the applied loads were varied (5, 10, 15, and 20 N). SEM images revealed that CNTs were uniformly distributed with relative agglomeration within the Cu/Fe matrix. The results showed that the hardness, density, and wear rates decreased while the percentage of porosity increased with increasing the CNT volume fraction. Furthermore, the wear rate for all the CNTs contents increased with the applied load.

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Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

10.26434/chemrxiv.6652955.v1 ◽

2018 ◽

Author(s):

Gen Hayase

Keyword(s):

Carbon Nanotubes ◽

Aspect Ratio ◽

Aqueous Solutions ◽

High Aspect Ratio ◽

Multiwall Carbon Nanotubes ◽

Multiwall Carbon ◽

Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

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