Electrical and Rheological Percolation in Polystyrene/MWCNT Nanocomposites

Kota, Arun K.; Cipriano, Bani H.; Duesterberg, Matthew K.; Gershon, Alan L.; Powell, Dan; Raghavan, Srinivasa R.; Bruck, Hugh A.

doi:10.1021/ma0711792

Cited by 276 publications

(167 citation statements)

References 25 publications

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“…Simulation using lattice models on a recursive square Husimi lattice, Corsi and Gujrati (2006) found a percolation threshold between 0.245-0.25. showed the occurrence of the percolation threshold at 22% in a composite of synthetic graphite particles dispersed in an epoxy-polyurethane resin. (Kota et al, 2007). For all η, the percolation threshold decreases when ξ increases.…”

Section: Discussionmentioning

confidence: 87%

Ising Model for Conductive Percolation in Electrically Conductive Adhesives by Considering Random Arrangement of Conducting Particles

A.¹

2012

American Journal of Applied Sciences

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Problem statement: Thermodynamically, particles in composites will arrange in a way such that the Helmholtz free energy is minimized. However, even a single structure has the lowest free energy, it should not ignore the probability of other structures having larger energies to occur, although at small chances. Approach: All possible arrangements of particles in the composites, therefore, must be taken into account in the theory or simulation development. Results: The composite energy depends on the interaction between components in the composites. To consider the effect of interactions on energy, in this study we used a simple Ising model incorporated with the BraggWilliams approximation. We used the model to predict the average packing fraction and the percolation threshold in composites as well as other quantities related to percolation phenomenon. Conclusion/Recommendations: We found several predictions that have not been reported by previous authors. This model can be important in the understanding conductivity development in electrically conductive adhesive composites.

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Section: Discussionmentioning

confidence: 87%

Ising Model for Conductive Percolation in Electrically Conductive Adhesives by Considering Random Arrangement of Conducting Particles

A.¹

2012

American Journal of Applied Sciences

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“…The PS/pristine MWCNT composite using toluene as dispersing medium was employed for comparison. The nanocomposite obviously exhibited the largest electrical conductivity (0.10 S m �1 ) at MWCNT loading of 1.0 wt.%, much larger than that of the neat PS (10 �16 to �20 S m �1 [11,12]) and the composite (0.0074 S m �1 ) with the same MWCNT content. The reason may lie in the MWCNT homogenous dispersion and the nondestructive pristine MWCNT electronic structure.…”

Section: Electronic Structure and Electrical Conductivitymentioning

confidence: 91%

A convenient route to disperse pristine carbon nanotubes in polystyrene with no damage of nanotube electronic structure

Zhang

Yang

Yuan

et al. 2012

Journal of Experimental Nanoscience

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“…The value of critical exponent not only depends on the type of polymer or CNT but also, on the method of nanocomposites preparation. Kota et al [35] used two different solvent namely DMF and THF for preparing PS/MWCNT nanocomposites and found two different t values of 1.5 and 1.9, respectively. In the literature there are large vari- The Inset: log-log plot for !…”

Section: Electrical Propertiesmentioning

confidence: 99%

Influence of selective dispersion of MWCNT on electrical percolation of in-situ polymerized high-impact polystyrene/MWCNT nanocomposites

Shrivastava¹,

Maiti²,

Suin³

et al. 2014

Express Polym. Lett.

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Abstract. This work demonstrates a simple method to develop highly conducting high impact polystyrene (HIPS)/multiwall carbon nanotube (MWCNT) nanocomposites through selective dispersion of MWCNT in HIPS matrix. The method involves in-situ polymerization of polybutadiene containing styrene monomer in the presence of HIPS beads and MWCNT. A significantly lower percolation threshold value than ever reported for HIPS/MWCNT systems was obtained using unmodified unaligned MWCNTs. With the increase in HIPS bead content (at a particular MWCNT loading) in the HIPS/MWCNT nanocomposites, the conductivity value was increased, suggesting that the presence of HIPS beads acted as excluded volume that decreased the percolation threshold. An increase in electrical conductivity from 1.91·10 -7 to 1.15·10 -5 S/cm was evident, when the HIPS bead content was increased from 30 to 60 wt% at a constant loading of MWCNT (i.e. 0.6 wt%). The morphological investigation of the HIPS/MWCNT nanocomposites revealed that, the MWCNTs were selectively dispersed in the in-situ polymerized HIPS region, outside the HIPS beads, which resulted in the lowering of the percolation threshold to a lower value of 0.54 wt%. The morphology and electrical properties of the nanocomposites have been discussed in detail in the manuscript.

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Electrical and Rheological Percolation in Polystyrene/MWCNT Nanocomposites

Cited by 276 publications

References 25 publications

Ising Model for Conductive Percolation in Electrically Conductive Adhesives by Considering Random Arrangement of Conducting Particles

Ising Model for Conductive Percolation in Electrically Conductive Adhesives by Considering Random Arrangement of Conducting Particles

A convenient route to disperse pristine carbon nanotubes in polystyrene with no damage of nanotube electronic structure

Influence of selective dispersion of MWCNT on electrical percolation of in-situ polymerized high-impact polystyrene/MWCNT nanocomposites

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