Influence of the polymer structure and nanotube concentration on the conductivity and rheological properties of polyethylene/CNT composites

Valentino, O.; Sarno, Maria; Rainone, N. G.; Nobile, Maria Rossella; Ciambelli, Paolo; Neitzert, H. C.; Simon, George P.

doi:10.1016/j.physe.2008.02.001

Cited by 143 publications

(95 citation statements)

References 16 publications

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“…Absolute values of the storage (G') and loss (G") moduli, as well as their frequency dependence, reveal viscoelastic response of the polymer and influence of filler on polymer matrix. been reported in earlier studies [32,34,35]. It is further noticed that by increasing the filler concentration, Figure 4c, the decrease in the absolute value of the damping factor (tan (δ) = G"/G') becomes more evident at the low frequency range (<0.1 rad/s).…”

Section: Rheological Responsesupporting

confidence: 78%

Influence of reduced graphene oxide on the rheological response and chain orientation on shear deformation of high density polyethylene

Liu

Andablo‐Reyes

Patil

et al. 2016

Polymer

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Section: Rheological Responsesupporting

confidence: 78%

Influence of reduced graphene oxide on the rheological response and chain orientation on shear deformation of high density polyethylene

Liu

Andablo‐Reyes

Patil

et al. 2016

Polymer

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“…These crystals prevented electrical contact between the nanotubes resulting in a decrease in electrical conductivity. Valentino et al [22] prepared a series of HDPE/MWCNT nanocomposites with different loadings of MWCNTs using a micro-twin screw extruder. They observed a low electrical percolation threshold of between 1 to 2.5 wt% indicating an effective dispersion of nanotubes in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of processing conditions on the structure, electrical and mechanical properties of melt mixed high density polyethylene/multi-walled CNT composites in compression molding

Xiang¹,

Guo²,

Kumar

et al. 2017

Materials Testing

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(2017). Effect of processing conditions on the structure, electrical and mechanical properties of melt mixed high density polyethylene/multi-walled CNT composites in compression molding. Materials Testing, 59 (2) Department of Materials Science and Engineering, University of Sheffield, S1 3JD, UK Abstract: Melt mixed high density polyethylene (HDPE)/multi-walled carbon nanotube (MWCNT) nanocomposites were prepared via twin-screw extrusion and then compression moulded into sheets. The effect of heating temperature, pressing time and cooling rate on the structure, electrical and mechanical properties of the compression moulded nanocomposites was systematically investigated. Volume resistivity tests indicate that the nanocomposite with 2 wt% MWCNTs, which is in the region of the electrical percolation threshold, is very sensitive to the compression moulding parameters such that heating temperature > pressing time > cooling rate. Generally, the resistivity of nanocomposites decreases with increasing heating temperature and pressing time. Interestingly, the electrical resistivity of the rapidly cooled nanocomposite with 2 wt% MWCNTs is 1~2 orders lower than that of the slowly cooled nanocomposite with the same MWCNT loading. This can be attributed to the lower crystallinity and smaller crystallites facilitating the formation of conductive pathways. The tensile properties of the nanocomposite with 2 wt% MWCNTs are also influenced by the compression moulding parameters to some extent, while those of the nanocomposites with higher MWCNT loading are insensitive to the changes in processing conditions. The predicted moduli from Halpin-Tsai and Mori-Tanaka theoretical models show good agreement with the experimental results. This work has important implications for both process control and the tailoring of electrical and mechanical properties in the commercial manufacture of conductive HDPE/MWCNT nanocomposites.

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“…The very high aspect ratio makes it likely that the addition of a small amount of CNTs strongly improves the electrical [1], thermal [2] and mechanical [3] properties of the polymer matrix. Thus, CNT/polymer composites combine the good processability of the polymers with the excellent mechanical and other functional properties of the CNTs.…”

Section: Introductionmentioning

confidence: 99%

Multi-walled carbon nanotube filled polypropylene nanocomposites based on masterbatch route: Improvement of dispersion and mechanical properties through PP-g-MA addition

Prashantha¹,

Soulestin²,

Lacrampe³

et al. 2008

Express Polym. Lett.

192

137

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Abstract. Multi-wall carbon nanotubes (MWNTs) filled polypropylene (PP) nanocomposites were prepared through diluting a PP/MWNT masterbatch in a PP matrix by melt compounding with a twin screw extruder. Polypropylene grafted maleic anhydride (PP-g-MA) was used to promote the carbon nanotubes dispersion. The effect of PP-g-MA addition on the rheological, mechanical and morphological properties of the nanocomposites was assessed for different MWNTs loadings. Scanning electron microscopy (SEM) has shown that nanotubes are distributed reasonably uniformly. A better dispersion and good adhesion between the nanotubes and the PP matrix is caused by wrapping of PP-g-MA on MWNTs. When PP-g-MA is added, dynamic moduli and viscosity further increases compared to PP/MWNT nanocomposites. The rheological percolation threshold drops significantly. Tensile and flexural moduli and Charpy impact resistance of the nanocomposites also increases by the addition of PP-g-MA. The present study confirms that PP-g-MA is efficient to promote the dispersion of MWNTs in PP matrix and serves as an adhesive to increase their interfacial strength, hence greatly improving the rheological percolation threshold and mechanical properties of PP/MWNT nanocomposites.

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Influence of the polymer structure and nanotube concentration on the conductivity and rheological properties of polyethylene/CNT composites

Cited by 143 publications

References 16 publications

Influence of reduced graphene oxide on the rheological response and chain orientation on shear deformation of high density polyethylene

Influence of reduced graphene oxide on the rheological response and chain orientation on shear deformation of high density polyethylene

Effect of processing conditions on the structure, electrical and mechanical properties of melt mixed high density polyethylene/multi-walled CNT composites in compression molding

Multi-walled carbon nanotube filled polypropylene nanocomposites based on masterbatch route: Improvement of dispersion and mechanical properties through PP-g-MA addition

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