Effect of silica particle size on chain dynamics and frictional properties of styrene butadiene rubber nano and micro composites

Pourhossaini, Mohammad-Reza; Razzaghi‐Kashani, Mehdi

doi:10.1016/j.polymer.2014.03.026

Cited by 55 publications

(32 citation statements)

References 26 publications

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“…This experimental study illustrates some general problems encountered with experimental validation of homogenization models, namely, incomplete set of constituent properties and the important role of interfacial phenomena at matrix/filler interfaces that affect effective stiffness both through incomplete bonding and also through alternations in the composite microstructure. For viscoelastic composites with nanosized inclusions, the inclusion surface area per unit volume increases greatly and the interfacial effects become prominent so for reliable predictions, one should necessarily explicitly account for the presence of the interfacial layers (see, e.g., Shashidhar and Shenoy, 2001;Berriot et al, 2002, 20 03;Heinrich and Klüppel, 20 02;Gauthier, 20 04;Ozmusul et al, 2005;Goertzen and Kessler, 2008;Fritzsche and Klüppel, 2011;Litvinov et al, 2011;Stockelhuber et al, 2011;Pourhossaini and Razzagni-Kashani, 2014;Underwood and Kim, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Time domain finite element estimates of dynamic stiffness of viscoelastic composites with stiff spherical inclusions

Gusev

2016

International Journal of Solids and Structures

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a b s t r a c tA weighted residual time domain unstructured mesh finite element approach was used to obtain numerical estimates for the dynamic stiffness of medium and high stiffness contrast composites consisting of viscoelastic epoxy matrix filled with stiff spherical inclusions. Both random and regular microstructure composites were studied. It was shown that over the broad temperature and inclusion fraction ranges studied, the generalized self-consistent model ( Christensen and Lo, 1979 ) provided accurate predictions for the effective dynamic stiffness of random composites obeying classical Percus-Yevick hard sphere statistics. Assuming sphere flocculation, we have studied the role of microstructural effects and found that upon increasing stiffness contrast, they become progressively more important for both the effective storage and loss moduli. As a consequence, for the reliable predictions of effective stiffness of high contrast composites with rubber like matrices, one should necessarily use homogenization models accounting not only for the inclusion concentration but also for the finer microstructural details. However, it was also found that for such high stiffness contrast viscoelastic composites, the ratio of their effective storage and loss shear moduli (the damping factor) remains essentially unchanged as compared to that of pure unfilled matrix so it is the invariability of the damping factor that can be viewed as a special signature of underlying micromechanical mechanism of reinforcement.

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Section: Introductionmentioning

confidence: 99%

Time domain finite element estimates of dynamic stiffness of viscoelastic composites with stiff spherical inclusions

Gusev

2016

International Journal of Solids and Structures

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“…Also, the researchers have related the substantial improvement of mechanical properties in the polymer nanocomposites to formation of a strong interphase between polymer and nanoparticles [16][17][18][19]. The influence of interface/interphase properties on the final performance of nanocomposites has paid much attention in the recent years.…”

Section: Introductionmentioning

confidence: 99%

A simple technique for determination of interphase properties in polymer nanocomposites reinforced with spherical nanoparticles

Zare

2015

Polymer

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“…However, nanocomposites show higher activation 9 Activation energy of chain mobilization versus titania volume percentage energy than micro-composites at the same filler volume percentage. This higher activation energy and its faster rate of increase with filler content for nanocomposites compared to micro-composites reveals the slower dynamics of EPR chains around the nano-particles regardless of the higher surface area of nano-titania [33]. As a result, the intensity of immobilization of one mole of rubber chains around nano-titania is higher than that for micro-titania.…”

Section: Dynamic Mechanical Behavior Of Compositesmentioning

confidence: 93%

Interfacial effects on dielectric properties of ethylene propylene rubber–titania nano- and micro-composites

et al. 2015

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The influence of titania particle size on dielectric properties of ethylene-propylene rubber (EPR) composites was investigated, with an emphasis on the chain dynamics in the interphase region. We hypothesized that a reduction in the conformational entropy of rubber chains in the interphase region would make the restricted chains more prone to orient along the applied electric field and increase dielectric permittivity than the chains in the bulk. The morphology and microstructure of the composites was characterized using scanning electron microscopy and atomic force microscopy, and a notable difference was detected in the average aggregate size and microstructure of the interphase between the nano-and microcomposites. We predicted that the physical attraction between nano-and micro-fillers and polymer, as characterized by the surface energy of fillers, would be similar. However, differences in the chain dynamics investigated by dynamic mechanical thermal analysis and dielectric spectroscopy confirmed the presence of more restricted chains, quantitatively and qualitatively, in the interphase region of the nanocomposites compared to the micro-composites. We concluded that the higher dielectric properties of the nanocomposites could be explained by the lower conformational entropy of chains in these composites compared to those in the micro-composites.

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Effect of silica particle size on chain dynamics and frictional properties of styrene butadiene rubber nano and micro composites

Cited by 55 publications

References 26 publications

Time domain finite element estimates of dynamic stiffness of viscoelastic composites with stiff spherical inclusions

Time domain finite element estimates of dynamic stiffness of viscoelastic composites with stiff spherical inclusions

A simple technique for determination of interphase properties in polymer nanocomposites reinforced with spherical nanoparticles

Interfacial effects on dielectric properties of ethylene propylene rubber–titania nano- and micro-composites

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