Thermal and thermoelastic properties of fast extrusion furnace (FEF) carbon black loaded SBR vulcanizates

Nasr, G. M.; Badawy, M.M.; Gwaily, S.E.; Attia, G.

doi:10.1002/pi.1995.210380306

Cited by 18 publications

(5 citation statements)

References 17 publications

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“…It seems as the CB content increases, the scorch time decreases and the rate of cure increases. It can be explained by the fact that the active groups on the CB surfaces are effective on the curing reaction and accelerate the vulcanization, on the other hand, thermal conductivity of compound increases in the presence of CB [4, 14]. Therefore, with existence of more CB amount in the compound cure process occurs in less time and higher rate, scorch time decreases and rate of cure increases.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is necessary to find the CB effects on the behavior of compound before, after, and during the process. Many researchers have investigated into the influences of CB on the physical [1, 2], thermal [3–6], electrical [7], rheological and viscoelastic [8–10], and vulcanization [1, 11, 12] properties of filled compounds. Using rubber process analyzer, Barres et al [10] showed that the relaxation modulus of a filled rubber compound has a good agreement with the viscoelastic integral model.…”

Section: Introductionmentioning

confidence: 99%

“…Other researchers [5] measured the hysteresis loss of NR and SBR compounds and found that the magnitudes of hysteresis loss increase with loading of carbon black. Also, it has been reported there is a relation between carbon black dispersion, thermal diffusivity and electrical resistively of rubber compounds [3–7]. The interfacial area between rubber and carbon black increases with dispersion; therefore, the new bonds are created, which affect the thermal and electrical resistance [6, 7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the cure characteristics and viscoelastic behavior of styrene‐butadiene rubber compounds by using a rubber process analyzer

Karrabi

Mohammadian-Gezaz

2010

Vinyl Additive Technology

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Viscoelastic and cure properties of styrene-butadiene rubber compounds were investigated by using a ''Rubber Process Analyzer.'' The effects of sulfur content in the cure system and carbon black (CB) type and concentration on the cure behavior of samples were studied. As the ratio of S/accelerator in the curative increased, the cure rate increased, and the cure time decreased. Here, the elasticity was analyzed by considering the drop in the maximum of viscous torque (D S 00 ) and the resilience, which increased for the cure systems in the order of conventional < semiefficient < efficient. Compounds with the higher loading and fine particle size of CB had the greater cure torque values, higher vulcanization rates, and the lower cure times. With increasing CB content and CB specific surface area, D S 00 diminished, hence the elasticity. The Payne effect was observed in all strain-sweep curves. At higher level and surface area of CB, the linear viscoelastic region disappeared, and the strain dependency of G 0 was more pronounced. For higher loading and smaller particle size of CB, the relaxation modulus declined rather abruptly, and relaxation time increased. These observations signified more viscous and less elastic responses in these samples. Viscoelastic properties of compounds were explained by considering the hydrodynamic and dilution effects.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the cure characteristics and viscoelastic behavior of styrene‐butadiene rubber compounds by using a rubber process analyzer

Karrabi

Mohammadian-Gezaz

2010

Vinyl Additive Technology

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“…The thermal conductivity ( k ), volumetric heat capacity ( C v ), and thermal diffusivity ( α ) of a pure polymer are greatly affected by temperature. 26 From Figures 8 and 9, it can be concluded that the thermal conductivity of MWCNT-filled SiR nanocomposites is higher than that of NG-filled silicone rubber at the same loading level. The results also remain true at all measured temperatures.…”

Section: Resultsmentioning

confidence: 89%

Thermal conductivity, thermal diffusivity, and volumetric heat capacity of silicone elastomer nanocomposites

Sahu

Gaba

Panda

et al. 2017

High Performance Polymers

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Silicone elastomer (SiR) nanocomposites were prepared using multiwalled carbon nanotubes (MWCNT) and nano-graphite (NG). The morphology of the SiR nanocomposites has been studied using scanning electron microscopy and high-resolution transmission electron microscopy techniques. Detailed analysis of the morphology reveals a uniform distribution of the MWCNT and NG filler particles in the silicone matrix. On increasing the filler loading, a continuous network structure is formed and aggregation takes place. The effect of the MWCNT and NG loadings on the thermal properties of the silicone elastomer has been investigated. The thermal properties of the SiR nanocomposites were measured by a thermal properties analyzer based on the transient hot-wire method. Studies also suggest that incorporation of nanoparticles improves the thermal conductivity of SiR nanocomposites. The thermal conductivity of SiR nanocomposites increased from 0.200 W/(m K) to 0.440 W/(m K) and to 0.310 W/(m K) for 6 wt% MWCNT and NG loadings, respectively. Because of the positive temperature coefficient and the conductive nature of the nanoparticles, the thermal conductivity of the material increased on increasing the temperature. The thermal diffusivity and the volumetric heat capacity of the SiR nanocomposites were measured. The thermal diffusivity of the SiR nanocomposites increased from 0.1194 mm2/s to 0.3209 mm2/s and to 0.2050 mm2/s for 6 wt% MWCNT and NG loadings, respectively. This indicates that the temperature response becomes faster with MWCNT and NG loadings. The volumetric heat capacity of the silicone elastomer nanocomposites decreased from 1.80 MJ/(m3K) to 1.34 MJ/(m3K) and to 1.40 MJ/(m3K) for 6 wt% MWCNT and NG loadings, respectively. Thus, MWCNT particles are more effective in increasing the thermal conductivity and diffusivity of the SiR nanocomposites, when compared to NG fillers at any loading.

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“…28 Thermal conduction mechanisms in PEO polymer matrix filled with highly conductive CB particles vary with the content of CB particles in which conductive networks and paths are formed. 29 The thermal conductivity changes according to the rearrangement of CB particles in the polymer matrix. When the concentration of CB varies, the thermal conductivity due to electrons varies in direct proportions to the electrical conductivity, whereas the thermal conductivity due to vibrations of atoms remain partially constant.…”

Section: Thermal Conductivity Resultsmentioning

confidence: 99%

Effect of carbon black on the thermoelectrical properties of poly(ethylene-oxide) composites

Elimat

Al-Hussami

Zihlif

2012

Journal of Composite Materials

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The AC electrical conduction and thermal conductivity of casted thin films of poly (ethylene oxide)/carbon black composites were investigated as a function of applied frequency in the range from 100 Hz to 5 MHz, temperature and carbon black concentrations 0, 1, 2, 4, 6, 8 and 10% by weight. The average films thickness was about 90 µm. The AC conductivity and dielectric properties were determined from impedance measurements. The study showed that the thermoelectrical properties are affected by adding carbon black filler into the poly (ethylene oxide) polymer matrix. The study observed that the dielectric constant and dielectric loss decrease with frequency, and increase with temperature, and carbon content. The AC-conductivity increases with increasing frequency, temperature and carbon black content. The observed percolation threshold of the AC-conductivity occurs at about 2 wt% carbon black concentration. The thermal conductivity of the prepared films was studied as a function of temperature and CB concentration. It was found that the thermal conductivity is enhanced by addition of the carbon black content and increasing temperature. In case of raising the temperature, the phonons are activated and electrons hopping to higher energy states, thus enhancement in the thermal conductivity is produced.

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Thermal and thermoelastic properties of fast extrusion furnace (FEF) carbon black loaded SBR vulcanizates

Cited by 18 publications

References 17 publications

Study of the cure characteristics and viscoelastic behavior of styrene‐butadiene rubber compounds by using a rubber process analyzer

Study of the cure characteristics and viscoelastic behavior of styrene‐butadiene rubber compounds by using a rubber process analyzer

Thermal conductivity, thermal diffusivity, and volumetric heat capacity of silicone elastomer nanocomposites

Effect of carbon black on the thermoelectrical properties of poly(ethylene-oxide) composites

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