Electrically and thermally conductive polyethylene/graphite composites and their mechanical properties

Krupa, Igor; Novák, Igor; Chodák, Ivan

doi:10.1016/j.synthmet.2004.05.007

Cited by 189 publications

(122 citation statements)

References 14 publications

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“…By way of contrast, graphite/LDPE and graphite/HDPE composites exhibit a straightforward increase in thermal conductive where the difference in the two types of composites is approximately constant in increasing filler loading. 23 This study of graphite/ PE composites calculates the contributions to the thermal conductivity from the amorphous and crystalline phases to be 0.091 and 0.593 W/mK, respectively. In our study, the percent crystallinity of LDPE and HDPE does not significantly change with the addition of SWNT, so the thermal conductivity of the matrix is constant with loading.…”

Section: Resultsmentioning

confidence: 99%

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

2006

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The thermal and electrical conductivities in nanocomposites of single walled carbon nanotubes (SWNT) and polyethylene (PE) are investigated in terms of SWNT loading, the degree of PE crystallinity, and the PE alignment. Isotropic SWNT/PE nanocomposites show a significant increase in thermal conductivity with increasing SWNT loading, having 1.8 and 3.5 W/mK at a SWNT volume fraction of φ ∼ 0.2 in low-density PE (LDPE) and high-density PE (HDPE), respectively. This increase in SWNT/HDPE is more than additive and suggests a reduction of the interfacial thermal resistance. Fitting the thermal conductivity data of the SWNT/ HDPE nanocomposites with two models indicates that the thermal conductivity relies on a percolating SWNT network. Oriented SWNT/HDPE nanocomposites exhibit higher thermal conductivities, which are attributed primarily to the aligned PE matrix.

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Section: Resultsmentioning

confidence: 99%

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

2006

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“…This study showed an insignificant change in matrix crystallinity. The influence of graphite, another possible filler to improve the thermal conductivity of phase change materials, on the change in the degree of crystallinity of HDPE was studied by Krupa et al [4]. A slight decrease in the melting temperature of the composites was observed, which suggested that the filler reduced the lamellar thickness of the crystallites.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the influence of Cu micro- and nano-particles on the thermal properties of polyethylene/Cu composites

Molefi¹,

Luyt

Krupa³

2009

Express Polym. Lett.

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Abstract. Polyethylene (LDPE, LLDPE and HDPE) composites with different copper (micro-and nano-sized particles) contents were prepared by melt mixing and compression moulding. The melting and crystallization behaviour of the different composites was analysed using a differential scanning calorimeter (DSC), and the thermal stability in a thermogravimetric analyser (TGA). The thermal conductivities of the samples were also determined. The DSC results show that the Cu micro-and nano-particles influence the crystallization behaviour of the polyethylenes in different ways. The extent to which the copper particles influence the crystallization behaviour of the polyethylenes also depends on the respective morphologies of the different polyethylenes. The TGA results show an observable influence of both the presence of copper and the sizes of the copper particles on the thermal stabilities of the polymers. Thermal conductivities increased with increasing Cu content, but there was little difference between the thermal conductivities of the samples containing Cu micro-and nano-particles.

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“…Conversely, measurement of electrical conductivity under strain can be a probe to understanding microstructural changes. Carbon black-filled conductive rubbers have wide applications, such as pressure sensitive sensors which can be used for shock proof switches [7], sensors for measurement of vehicle weights to collect toll tax on roads [8], and smart flexible sensors adapted to textile structures, able to measure their strain deformations [9], and tactile sensor that is thin and flexible and able to attach to a curved surface and will make the robot operate in unstructured environments [10,11]. For an electronic application of the CPC, the sensor should have a good linear behavior (with the effect of elongation), while the specific electrical resistivity of the system should be in a measurable range (<100 Ω·m) [12].…”

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.

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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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Electrically and thermally conductive polyethylene/graphite composites and their mechanical properties

Cited by 189 publications

References 14 publications

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

Comparison of the influence of Cu micro- and nano-particles on the thermal properties of polyethylene/Cu composites

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

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