Conductive polymer composites (CPCs): comparison of electrical properties of poly(ethylene‐<i>co</i>‐ethyl acrylate)‐carbon black with poly(butylene terephthalate)/poly(ethylene‐<i>co</i>‐ethyl acrylate)‐carbon black

Feller, Jean‐François; Linossier, Isabelle; Lévesque, Guy

doi:10.1002/pat.254

Cited by 60 publications

(37 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The effect can appear during melting of the crystalline regions of the polymer and sharp increase of the polymer matrix volume. In turn, this leads to break of the conductive chains and to a dramatic growth of the resistance [18,34,38]. In Ref.…”

Section: Thermal Expansion Of the Compositesmentioning

confidence: 99%

PTC effect and structure of polymer composites based on polyethylene/polyoxymethylene blend filled with dispersed iron

Mamunya

Muzychenko

Lebedev

et al. 2006

Polymer Engineering & Sci

View full text Add to dashboard Cite

The temperature dependence of resistivity, structure, and thermal expansion of composites based on polyethylene/polyoxymethylene (PE/POM) blends filled with dispersed iron (Fe) have been studied. The dependence of conductivity on filler content shows percolation behavior, with the values of the percolation thresholds equal to 21 vol% for PE‐Fe, 24 vol% for POM‐Fe, and 9 vol% for the filled blend PE/POM‐Fe, with two‐step character of the conductivity curve. The evolution of structure of the composite PE/POM‐Fe demonstrates transition from polymer matrix POM‐Fe, with inclusions of PE through cocontinuous phases of both POM‐Fe and PE, to PE matrix, with inclusions of POM‐Fe. Such a structure occurs due to localization of the filler only in one of the polymer phases, namely in POM. Measurements of the coefficient of thermal expansion α show the presence of two values of α: higher value (equal to α of PE) and lower value (equal to α of POM‐Fe), the transition between them corresponding to the structure with cocontinuous phases. The PE/POM‐Fe composites demonstrate double‐positive temperature coefficient (PTC) effect, with the presence of two transitions and a plateau between them. In such a system, two contributions to the PTC effect coexist: the first contribution originates from the thermal expansion of the nonconductive PE phase with higher value of the coefficient α, which leads to the break of the continuity of the conductive POM‐Fe phase; the second contribution originates from the break of the conductive structure of the filler inside the POM‐Fe phase because of the morphological changes in the vicinity of the melting temperature of POM. The double PTC effect is explained in terms of these two processes (thermal expansion and melting). POLYM. ENG. SCI., 47:34–42, 2007. © 2006 Society of Plastics Engineers

show abstract

Section: Thermal Expansion Of the Compositesmentioning

confidence: 99%

PTC effect and structure of polymer composites based on polyethylene/polyoxymethylene blend filled with dispersed iron

Mamunya

Muzychenko

Lebedev

et al. 2006

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…For many applications, it is useful to decrease the percolation threshold to both reduce the CPC cost and make the processing easier. This can be achieved with multiphase CPC matrices [3,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of clay nanofiller on electrical and rheological properties of conductive polymer composite

2004

View full text Add to dashboard Cite

“…If there is a simple relationship between electrical conductivity and external variables such as temperature [3,4] and mechanical stretching [5,6], the composite has potential applications as a sensor. For these reasons, the development of new conductive composites requires an understanding of the changes in conductivity that might occur in service.…”

Section: Introductionmentioning

confidence: 99%

Effect of extensional cyclic strain on the mechanical and physico-mechanical properties of PVC-NBR/graphite composites

Mansour¹

2008

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. The variation of electrical resistivity as will as the mechanical properties of PVC (polyvinylchloride)-NBR (acrylonitrile butadiene rubber) based conductive composites filled with different concentrations of graphite were studied. These samples were studied as function of the constant deformation fatigue test. When the specimen was subjected to a large number of rapidly repeating strain cycles, and different strain amplitudes, the conductivity, σ(T), shows an initial rapid fall followed by dynamic equilibrium. Increasing the number of cycles and strain amplitudes, the conductivity remains almost constant over the temperature range 30-140°C. The equilibrium state between destruction and reconstruction of graphite particles has been detected for all strains of certain values of strain cycles (1000, 2000, 3000, and 4000 cycles for 30% strain amplitude). A preliminary study was done to optimize the possibility to use Conductive Polymer Composites (CPC) as a strain sensor and to evaluate its performance by an intrinsic physico-mechanical modification measurement. The electromechanical characterization was performed to demonstrate the adaptability and the correct functioning of the sensor as a strain gauge on the fabric. The coefficient of strain sensitivity (K) was measured for 50 phr graphite/PVC-NBR vulcanized at 3000 number of strain cycles and 30% strain amplitude. There was a broad maximum of K, with a peak value of 82, which was much higher, compared to conventional wire resistors. A slight hysteresis was observed at unloading due to plasticity of the matrix. A good correlation exists between mechanical and electrical response to the strain sensitivity. Mechanical reinforcement was in accordance with the Quemada equation [1] and Guth model [2] attested to good particle-matrix adhesion. It was found that the viscous component of deformation gradually disappeared and the hardening occurred with increasing strain cycles. The modulus, fracture strength, and elongation at break increased with increasing filler volume fraction up to 40 phr of graphite particles.

show abstract

Conductive polymer composites (CPCs): comparison of electrical properties of poly(ethylene‐co‐ethyl acrylate)‐carbon black with poly(butylene terephthalate)/poly(ethylene‐co‐ethyl acrylate)‐carbon black

Cited by 60 publications

References 37 publications

PTC effect and structure of polymer composites based on polyethylene/polyoxymethylene blend filled with dispersed iron

PTC effect and structure of polymer composites based on polyethylene/polyoxymethylene blend filled with dispersed iron

Influence of clay nanofiller on electrical and rheological properties of conductive polymer composite

Effect of extensional cyclic strain on the mechanical and physico-mechanical properties of PVC-NBR/graphite composites

Contact Info

Product

Resources

About