Investigation on the dependence of the electrical conductivity of FEF/SBR vulcanizates on the cyclic strain

Amin, M.; Nasr, G. M.; Hassan, H. H.; El-Guiziri, S. B.; Abu-Abdeen, M.

doi:10.1007/bf00263081

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Some of the composite samples were subjected to a constant number (100) of rapid dynamic flex cycles of constant frequency (5.9 cycles/s), and at different amplitudes in a constant deformation fatigue tester [16]. The number of flex cycles and amplitude of flexing were varied.…”

Section: Application Of Pre-strainmentioning

confidence: 99%

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

Mansour¹

2008

Express Polym. Lett.

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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.

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Section: Application Of Pre-strainmentioning

confidence: 99%

“…The resistivity was measured with a four-terminal technique [16] using a DC power supply model HY 5003 as voltage source and a Keithley model 616 for current measurements. Specimens (20×2× 2) mm were uniaxially extended at room temperature using an (AMETEK, USA) universal testing machine.…”

Section: Electrical Properties With Strainmentioning

confidence: 99%

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

Mansour¹

2008

Express Polym. Lett.

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“…The dependence of the physical, thermal, mechanical and electrical, etc, properties of carbon-black-loaded rubber vulcanizates on the type and size of filler and the type of host rubber still attracts the interest of both theoretical and experimental investigators [1][2][3][4][5][6][7][8][9][10]. The choice of a filler-rubber combination to produce new composites suitable for a typical technological application is certainly important [11][12][13][14][15]. The mechanical properties of rubber composites have widespread engineering importance due to its continuous and increasing need for durable composites.…”

Section: Introductionmentioning

confidence: 99%

Strain energy density of carbon-black-loaded rubber vulcanizates

Ellawindy

El-Guiziri

2000

J. Phys. D: Appl. Phys.

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The strain energy density behaviour is studied at room temperature, for 100 phr (parts per 100 parts of rubber by weight) FEF carbon-black-loaded styrene-butadiene rubber (SBR), natural rubber (NR), butadiene-acryle nitrial rubber (NBR), butyl rubber (IIR) and butadiene rubber (BR). This behaviour is also studied for 100 phr of different types of carbon-black, (intermediate super abrasion furnace) (ISAF), high abrasion furnace (HAF), fast extrusion furnace (FEF), semi-reinforcing furnace (SRF) and easy processing channel (EPC)-)loaded SBR rubber vulcanizates and for different concentrations of FEF carbon-black-loaded SBR rubber vulcanizates. The shear modulus for all composites is also obtained and discussed. These data are used to calculate the strain energy density using the equation proposed by Blatz et al (1974 Trans. Soc. Rheol. 18 145-61), based on the n-measure of Sethe. It is found that the n-measure is still a material constant, even after the addition of carbon black, but with higher values than that for unloaded rubber.

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Influence of dynamic cyclic extension on the electrical conductivity of fast extrusion furnace (FEF) black loaded rubber vulcanizates

Nasr

Darwish

Khairy

et al. 1995

Polymer International

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The influence of dynamic cyclic extension on the electrcal conductivity (σ) of 100 parts FEF carbon black loaded rubber (NR and SBR) vulcanizates was studied. The conductivity showed an initial rapid decrease with increasing cyclic strain amplitude, indicating a probable breakdown of the carbon black structure, owing to the masking of carbon particles by insulating rubber layers. The conduction mechanisms in these composites in terms of both the number of strain cycles and the strain amplitude were also studied. In addition, the temperature coefficient of conductivity was calculated for different amplitudes. It was greatly affected by the magnitude of the strain amplitude.

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Investigation on the dependence of the electrical conductivity of FEF/SBR vulcanizates on the cyclic strain

Cited by 7 publications

References 2 publications

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

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

Strain energy density of carbon-black-loaded rubber vulcanizates

Influence of dynamic cyclic extension on the electrical conductivity of fast extrusion furnace (FEF) black loaded rubber vulcanizates

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