Effect of Cyclic Deformations on the Dynamic‐Mechanical Properties of Silica‐Filled Butyl Rubber

Ward, Azza A.; Stoll, B.; Soden, W. v.; Herminghaus, Stephan; Mansour, Ahmed S.

doi:10.1002/mame.200300135

Cited by 15 publications

(7 citation statements)

References 26 publications

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“…The cyclic deformations would release this trapped rubber making the matrix more homogeneous. Consequently, the effective filler volume fraction would decrease 30 . The decrease in effective filler volume fraction and the homogenization of the matrix may be the reason for the initial decrease in ɛ r and tan δ.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the effective filler volume fraction would decrease. 30 The decrease in effective filler volume fraction and the homogenization of the matrix may be the reason for the initial decrease in e r and tan d. At higher volume fractions of filler, because the possibility for particle agglomeration is high, this effect will be more distinguishable.…”

Section: Wwwceramicsorg/actmentioning

confidence: 99%

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Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Thomas

Chameswary

Sebastian

2011

International Journal of Applied Ceramic Technology

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Mechanically flexible butyl rubber–SrTiO3 composites were prepared through sigma mixing followed by hot pressing. Tensile tests established the mechanical flexibility of the composites. Swelling tests revealed the degree of matrix–filler interactions. The effect of SrTiO3 ceramic filler on the dielectric properties of the composites was studied at 1 MHz and 5 GHz using an LCR meter and a Split Post Dielectric Resonator, respectively. The relative permittivity of the composites increased with filler loading while maintaining low dielectric loss. For the maximum filler content of 0.42 volume fraction, the composite showed a relative permittivity of 13.2 and a loss tangent of 2.8 × 10−3 at 5 GHz. Theoretical modeling of effective relative permittivity of the composites was performed and the results were correlated with the experimental data. Effect of repeated bending on the microwave dielectric properties of the composite was also studied. The coefficient of thermal expansion of the composites was observed to decrease with the increased ceramic filler dispersion and reached a minimum value of 26.2 ppm/°C.

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Section: Resultsmentioning

confidence: 99%

Section: Wwwceramicsorg/actmentioning

confidence: 99%

Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Thomas

Chameswary

Sebastian

2011

International Journal of Applied Ceramic Technology

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show abstract

“…In Table 2, the values of storage modulus E' at 25 o C and glass transition temperature Tg increase with increasing WIP. This enhancement of storage modulus E' can be related to forming the EPDM/WIP network and WIP agglomeration [32,33]. The increased Tg of EPDM/WIP is attributed to molecular motion restriction and cross-link density [34].…”

Section: Dynamic Mechanical Properties Of Epdm/wip Compositesmentioning

confidence: 99%

Cost-Effective and Environmentally Friendly Flexible Magnetic EPDM rubber Composites Based on Ground Waste Tires (GRW) and Waste Iron Powder

Shafik

Labeeb

wissa

et al. 2023

Preprint

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One of the main issues facing environmental and human health protection is managing and further use of waste tires. Upcycling is a successful recycling strategy that aims to incorporate shredded discarded tires into polymer blends to create products with added value for different uses. Two-roll mill laboratories mixer were used to prepare low-cost, flexible magnetic composites based on an EPDM rubber/ground waste tyres (GRW) blend as a host matrix and waste iron powders (WIP) as dispersed filler. Tensile strength, elongation at break, hardness (shore A) and dynamic mechanical analysis (DMA) were used to evaluate the physico-mechanical properties of the produced blends. The thermal properties of the produced blends were also tested using thermo gravimetric analysis, and the morphology of the blends was observed using a scan electron microscope. The electrical and magnetic properties of the mixtures were also tested. The elemental analysis of the WIP sample showed that it contains about 2.19% SiO2, 76.57% Fe2O3 and 21.24% O2, respectively. Mainly, the investigated mechanical parameters (elongation at break & hardness) increased with increasing the WIP content. A notable decrease of tensile strength upon reaching 50phr WIP is noticed. Enhancement in the thermal stability of EPDM/WIP composites is noticed by increasing WIP content. SEM micrographs detect agglomerates at higher WIP content, resulting in mechanical properties' failure. Moreover, the values ε'& ε' improved by rising WIP content. Also, the electrical conductivity "σ" reaches 10− 4 S/cm for 60 phr WIP. Further, the EPDM/WIP composites may be appropriate for creating soft magnetic materials, which have several applications.

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“…where, the biodegradability increased by increasing filler content. This behavior could be explained on the basis of the tendency of filler particles to agglomerate and forming clusters in various shapes and sizes [20] and [21]. This in turn gives rise to strong filler-filler interactions together with bad dispersion in the matrix.…”

Section: Biodegradationmentioning

confidence: 99%

Biophysical properties of polymethyl methacrylate blended with maleated castor oil filled with Calcium Carbonates in the micro and nano scales

Saied¹,

Ward²,

Saad³

et al. 2019

Egypt. J. Chem.

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T HE biophysical properties of films prepared from polymethyl methacrylate (PMMA) blended with maleated castor oil (COMA) with composition 70/30 wt% filled with different concentrations of calcium carbonate (CaCO 3 ) in the micro and nano scales have been studied. The prepared films were characterized through different techniques such as, thermo gravimetric analysis TGA, scanning electron microscope SEM, differential scanning calorimetry DSC, in addition to dielectric properties at range of frequency from 0.1 Hz to 5 MHz and temperature range from (30 to 90) o C. The data obtained for the two investigated systems indicate that the dielectric permittivity ε' and dielectric loss ε" increased by increasing either the concentration of the filler or the temperature. Results of the electrical conductivity σ indicated that COMA is recommended to be used for electrostatic dissipation applications. Moreover the enzymatic degradation of the prepared films indicates that the weight remaining decrease with increasing either the time of immersing or the concentration of the filler.

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Effect of Cyclic Deformations on the Dynamic‐Mechanical Properties of Silica‐Filled Butyl Rubber

Cited by 15 publications

References 26 publications

Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Cost-Effective and Environmentally Friendly Flexible Magnetic EPDM rubber Composites Based on Ground Waste Tires (GRW) and Waste Iron Powder

Biophysical properties of polymethyl methacrylate blended with maleated castor oil filled with Calcium Carbonates in the micro and nano scales

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