Analysis of the electrical and rheological behavior of different processed CNF/PMMA nanocomposites

Varela-Rizo, H.; de, G. Montes; Rodriguez-Pastor, I.; Monti, Marco; Terenzi, Andrea; Martı́n-Gullón, Ignacio

doi:10.1016/j.compscitech.2011.11.005

Cited by 24 publications

(11 citation statements)

References 43 publications

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“…This may be attributed to the slower evaporation rate of the solvent and faster precipitation of the nanoparticles at the bottom and exposing more polymeric material on top. Our results are much superior (surface resistivity of *3.9 9 10 4 X/sq for 10 CNF) when compared to VarelaRizo et al [44], where they reported 6.06 9 10 4 X/sq of surface resistivity for 10 % (w/w) CNF-based poly(methyl methacrylate) (PMMA) nanocomposite film by using solvent casting. To achieve high electrical conductivity, carbon nanofillers from lower to higher concentration were tried.…”

Section: Surface Resistivity Of Nanocomposite Filmssupporting

confidence: 34%

Carbon nanofillers incorporated electrically conducting poly ε-caprolactone nanocomposite films and their biocompatibility studies using MG-63 cell line

et al. 2015

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Poly e-caprolactone (PCL)-based nanocomposite films were prepared by solvent casting method with different electrically conducting carbon nanofillers like carbon nanofiber (CNF), nanographite and liquid exfoliated graphite. These nanocomposite films show remarkable increase in both surface and bulk electrical conductivity. Continuous network of nanofillers in polymer matrix was observed under high-resolution transmission electron microscopy (HRTEM). The spreading resistance images in AFM showed the presence of nanofillers on the nanocomposite films. These films reveal strong directional effect in electrical conductivity towards longitudinal direction than transverse. PCL film dispersed with 10 % (w/w) CNF showed an electrical conductivity of 19 S/m at longitudinal direction as compared to 1 S/m at transverse direction. This can be best explained with the arrangement of nanofillers along longitudinal direction during solution casting method which is evident from HRTEM images. The electrical conductivity of the nanocomposite films increased in the presence of phosphate buffer saline and simulated body fluid with time. MTT and nuclear staining experiments with osteoblast MG63 cells clearly demonstrated good biocompatibility of these materials. Among all the nanofillers, CNF looks most promising for biomedical applications of PCL-based conducting nanocomposites, as it shows high electrical conductivity and good cell proliferation.

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Section: Surface Resistivity Of Nanocomposite Filmssupporting

confidence: 34%

Carbon nanofillers incorporated electrically conducting poly ε-caprolactone nanocomposite films and their biocompatibility studies using MG-63 cell line

et al. 2015

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“…Many factors are known to affect the electrical resistivity of CNT-polymer nanocomposites, such as the content of CNTs and their properties (e.g., type of CNTs, aspect ratio, morphology and surface functionalization degree), the type of polymer matrix, together with mixing and shaping process [ 3 , 7 , 13 ]. Many studies have been focused on the relationship between processing conditions and electrical properties, in order to obtain highly efficient CNT nanocomposites in terms of low electrical resistivity and percolation threshold [ 14 , 15 , 16 , 17 ]. As for the mixing process, it has been widely reported that MWCNT dispersion is a key point in determining the electrical performance of the resulting nanocomposites [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Injection Molding Conditions on Crystalline Structure and Electrical Resistivity of PP/MWCNT Nanocomposites

et al. 2020

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Polypropylene (PP) / multi-walled carbon nanotube (MWCNT) nanocomposites were prepared by melt-mixing and used to manufacture samples by injection molding. The effect of processing conditions on the crystallinity and electrical resistivity was studied. Accordingly, samples were produced varying the mold temperature and injection rate, and the DC electrical resistivity was measured. The morphology of MWCNT clusters was studied by optical and electron microscopy, while X-ray diffraction was used to study the role of the crystalline structure of PP. As a result, an anisotropic electrical behavior induced by the process was observed, which is further influenced by the injection molding processing condition. It was demonstrated that a reduction of electrical resistivity can be obtained by increasing mold temperature and injection rate, which was associated to the formation of the γ-phase and the related inter-cluster morphology of the MWCNT conductive network.

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“…Additionally, it has been commonly established that rheological analysis, besides being a method to study viscoelastic properties to assess processing behavior, provides insights into the interaction between carbon nanostructures and polymer in the melt state. In this regard several attempts to correlate electrical conductivity with rheological properties have been discussed in CNT and/or CNF‐based polymer composites . One important conclusion reported in these studies is that the elastic load rheological parameters: G′ and G′ / G″ , are the most appropriate values when compared with the onset of electrical percolation .…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal conductivity of rheologically percolated carbon nanofiber reinforced polypropylene composites

Paleo

García

Arboleda-Clemente

et al. 2015

Polymers for Advanced Techs

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Three different types of carbon nanofibers (CNF) were incorporated in the same polypropylene (PP) matrix by twin-screw extrusion. The rheological and thermal properties were investigated. The rheological characterization of CNFs/PP composites as function of their volume fraction shows different microstructures: percolated and non-percolated behaviors of their CNF's networks. In this work, the laser flash technique is employed in the experimental determination of the thermal diffusivity and conductivity of composites at room temperature. The ultimate aim is to correlate microstructure described by rheological analysis with final thermal properties. The results show that thermal diffusivity and conductivity are clearly higher for rheologically percolated composites suggesting that above certain critical content of nanofibers thermal transport is mainly controlled by percolated structures caused by interconnected CNFs' networks. Finally, thermal conductivity results are described by means of percolation theory from which an intrinsic thermal conductivity for the CNFs' network of approximately 6.5 W/ m K, i.e. close to three times lower than some values reported in literature for SWCNTs' networks, was calculated.

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Analysis of the electrical and rheological behavior of different processed CNF/PMMA nanocomposites

Cited by 24 publications

References 43 publications

Carbon nanofillers incorporated electrically conducting poly ε-caprolactone nanocomposite films and their biocompatibility studies using MG-63 cell line

Carbon nanofillers incorporated electrically conducting poly ε-caprolactone nanocomposite films and their biocompatibility studies using MG-63 cell line

Effect of Injection Molding Conditions on Crystalline Structure and Electrical Resistivity of PP/MWCNT Nanocomposites

Enhanced thermal conductivity of rheologically percolated carbon nanofiber reinforced polypropylene composites

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