Electrical and rheological percolation of PMMA/MWCNT nanocomposites as a function of CNT geometry and functionality

McClory, Caroline; McNally, Tony; Baxendale, Mark; Pötschke, Petra; Blau, Werner J.; Ruether, Manuel

doi:10.1016/j.eurpolymj.2010.02.009

Cited by 190 publications

(141 citation statements)

References 46 publications

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“…Value of critical percolation threshold by using (1) is around 0.5 weight percent for DBSACoNPs/PMMA while that for CoNPs/PMMA is around 1 weight percentage of CoNPs. Values of percolation threshold for both the systems improved from previously reported percolation values for polymer composite incorporated conducting materials as filler [24]. On the parallel side a relatively high maximum value in the conductivity was observed for CoNPs/PMMA composites.…”

Section: Electrical Charactersupporting

confidence: 76%

Surfactant Incorporated Co Nanoparticles Polymer Composites with Uniform Dispersion and Double Percolation

Hussain

Ahmad

Nawaz

et al. 2017

Journal of Chemistry

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Series of Cobalt nanoparticles incorporated polymethylmethacrylate composites in the presence and absence of dodecyl-benzenesulphonic acid (DBSA-CoNPs/PMMA and CoNPs/PMMA, resp.) were synthesized by solution mixing methodology. UV-visible and FTIR techniques were used to confirm the formation of nanocomposite. UV-visible spectra of the composites showed the incorporation of filler particles in the polymer matrix. On the other hand, FTIR spectra indicated the physical interaction between the two phases of the composite. Moreover, the electrical nature of the composites was studied by plotting graphs between electrical conductivity (measured using LCR meter at 100 kHz) and contents of the filler particles as introduced in the polymer matrix. An increase in electrical conductivity was first observed with increasing filler concentration up to the critical percolation threshold value (0.5% for DBSA-CoNPs/PMMA and 1% for CoNPs/PMMA), which then dropped upon further increments in the filler content. However, at higher concentrations, a second jump in the conductivity was observed in case of DBSA-CoNPs/PMMA composites.

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Section: Electrical Charactersupporting

confidence: 76%

Surfactant Incorporated Co Nanoparticles Polymer Composites with Uniform Dispersion and Double Percolation

Hussain

Ahmad

Nawaz

et al. 2017

Journal of Chemistry

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“…These curves have been extensively used to investigate modifications in the structure of several polymeric systems at a fixed temperature [57][58][59]. According to McClory et al [60] any change in the curve behavior of the composite compared with the neat PPy is an indication of network formation. It is observed that with increasing PPy.DBSA or PPy.Cl content, the variation of G& as a function of G% for TPU/PPy.DBSA and TPU/PPy.Cl blends at lower frequency region (terminal zone) is different from that found for neat TPU.…”

Section: Results and Discussion 31 Characterization Of Conductive Fmentioning

confidence: 99%

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

Ramôa¹,

Barra²,

Merlini³

et al. 2015

Express Polym. Lett.

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Abstract. This work describes the production of electrically conductive nanocomposites based on thermoplastic polyurethane (TPU) filled with montmorillonite-dodecylbenzenesulfonic acid-doped polypyrrole (Mt-PPy.DBSA) prepared by melt blending in an internal mixer. The electrical conductivity, morphology as well as the rheological properties of TPU/MtPPy.DBSA nanocomposites were evaluated and compared with those of TPU nanocomposites containing different conductive fillers, such as polypyrrole doped with hydrochloride acid (PPy.Cl) or dodecylbenzenesulfonic acid (PPy.DBSA) or montmorillonite-hydrochloride acid-doped polypyrrole (Mt-PPy.Cl), prepared with the same procedure. The TPU/MtPPy.DBSA nanocomposites display a very sharp insulator-conductor transition and the electrical percolation threshold was about 10 wt% of Mt-PPy.DBSA, which was significantly lower than those found for TPU/Mt-PPy.Cl, TPU/PPy.Cl and TPU/PPy.DBSA. Morphological analysis highlights that Mt-PPy.DBSA filler was better distributed and dispersed in the TPU matrix, forming a denser conductive network when compared to Mt-PPy.Cl, PPy.Cl and PPy.DBSA fillers. This morphology can be attributed to the higher site-specific interaction between TPU matrix and Mt-PPy.DBSA. The present study demonstrated the potential use of Mt-PPy.DBSA as new promising conductive nanofiller to produce highly conductive polymer nanocomposites with functional properties.

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“…In general, there are three main approaches to preparing polymer/CNT nanocomposites: in situ polymerization [9], solution mixing [10] and melt mixing [11], in which melt mixing is a simpler and more effective method, particularly from an industrial perspective [12]. In recent years, many studies on the melt mixing of CNTs into polymers have been carried out which indicate that the mixing effectiveness and the dispersion of CNTs depend on many factors including the affinity between CNTs and polymer [13], polymer viscosity [14], CNTs concentration [15], residence time [15], screw speed [15] [16] and screw configuration [17].…”

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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Electrical and rheological percolation of PMMA/MWCNT nanocomposites as a function of CNT geometry and functionality

Cited by 190 publications

References 46 publications

Surfactant Incorporated Co Nanoparticles Polymer Composites with Uniform Dispersion and Double Percolation

Surfactant Incorporated Co Nanoparticles Polymer Composites with Uniform Dispersion and Double Percolation

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

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

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