Impact of Filler Surface Modification on Large Scale Mechanics of Styrene Butadiene/Silica Rubber Composites

Stöckelhuber, Klaus Werner; Svistkov, A. S.; Pelevin, A. G.; Heinrich, Gert

doi:10.1021/ma1026077

Cited by 326 publications

(236 citation statements)

References 35 publications

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“…The earlier onset of nonlinearity has been previously attributed to the effect of strain amplification: the matrix experiences a higher local strain than the macroscopic strain due to the presence of the stiff nanotubes (Richter et al 2009;Costa et al 2008). This effect is generally enhanced by confinement of polymer chains located near the surface of a nanotube (Stöckelhuber et al 2011;Vilgis 2005). Since no specific surface modification of MWCNTs was performed in our materials, chemical interactions between the matrix and CNTs are likely to be weak.…”

Section: Resultsmentioning

confidence: 99%

Viscoelastic melt rheology and time–temperature superposition of polycarbonate–multi-walled carbon nanotube nanocomposites

2013

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This work investigates the linear and non-linear viscoelastic melt rheology of four grades of polycarbonate melt compounded with 3 wt% Nanocyl NC7000 multiwalled carbon nanotubes and of the matching matrix polymers. Amplitude sweeps reveal an earlier onset of nonlinearity and a strain overshoot in the nanocomposites. Mastercurves are constructed from isothermal frequency sweeps using vertical and horizontal shifting. Although all nanocomposites exhibit a second plateau at ∼10 5 Pa, the relaxation times estimated from the peak in loss tangent are not statistically different from those of pure melts estimated from cross-over frequencies: all relaxation timescales scale with molar mass in the same way, evidence that the relaxation of the polymer network is the dominant mechanism in both filled and unfilled materials. Non-linear rheology is also measured in large amplitude oscillatory shear. A comparison of the responses from frequency and amplitude sweep experiments reveals the importance of strain and temperature history on the response of such nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Viscoelastic melt rheology and time–temperature superposition of polycarbonate–multi-walled carbon nanotube nanocomposites

2013

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“…The mechanical properties of elastomer-based nanocomposites, consisting of inorganic nanoparticles dispersed in the polymer matrix, depend drastically on the interactions between the polymer matrix and the nanofillers. 7,8 Different dynamic moduli can be obtained by tuning these interactions, which leads to the desired increase of mechanical reinforcement at low strain magnitudes. However, a significant loss of the composite's rigidity appears at higher strain magnitudes.…”

Section: Introductionmentioning

confidence: 99%

A coarse-grained molecular dynamics study of segmental structure and mobility in capped crosslinked copolymer films

Davris

Lyulin

2015

The Journal of Chemical Physics

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We present results from molecular-dynamics simulations of a generic bead-spring model of copolymer chains confined between solid walls and report on the glass-transition temperature and segmental dynamics as a function of film thickness and mesh size (the end-to-end distance of the subchains in the crosslinked polymer networks). Apparently, the glass-transition temperature displayed a steep increase for mesh-size values much smaller than the radius of gyration of the bulk chains, otherwise it remained invariant to mesh-size variations. The rise in the glass-transition temperature with decreasing mesh size and film thickness was accompanied by a monotonic slowing-down of segmental dynamics on all studied length scales. This observation is attributed to the correspondingly decreased width of the bulk density layer that was obtained in films whose thickness was larger than the end-to-end distance of the bulk polymer chains. To test this hypothesis, additional simulations were performed in which the crystalline walls were replaced with amorphous or rough walls. In the amorphous case, the high polymer density close to the walls vanished, but the dynamic response of the film was not affected. The rough walls, on the other hand, only slightly decreased the density close to the walls and led to a minor slowing-down in the dynamics at large length-scales.

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“…The adjacent inclusions under deformation retain their relative position in the groups of small agglomerates. This contradicts the popular theory [6,7], according to which the most loaded part of the matrix is in the small gaps at the vicinity of polymer-filler interphase. Our experimental studies have shown that the more preferable scenario is the redistribution of the load over the relatively filler-free areas of the matrix than the moving apart of adjacent inclusions.…”

Section: Discussionmentioning

confidence: 66%

“…The surface of active filler in rubber matrix is covered by glassy-like layer of immobilized polymer chains [4,5]. According to theory [6][7][8], this layer gradually goes into matrix (the overall thickness of the modified polymer is ~10 nm). Some authors suppose, that being deformed, polymer in this layer is stretched and forms oriented strands [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…According to theory [6][7][8], this layer gradually goes into matrix (the overall thickness of the modified polymer is ~10 nm). Some authors suppose, that being deformed, polymer in this layer is stretched and forms oriented strands [6,7]. However, studies of the stretched filled rubber surface show that adjacent inclusions in the stretched material don't go apart, but move in groups and retain their relative position [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Local elongation of stretched filled rubber surface

Морозов¹,

Izumov²,

Garishin³

2018

Express Polym. Lett.

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Abstract. Local elongation of the surface of a stretched rubber is estimated by comparing the stiffness of stretched filled (30 or 50 phr of silicica) styrene-butadiene vulcanizate and the results of finite element simulation of the indentation of the unfilled elastomer. The local strain exceeds the macroscopic value, yet the weakly loaded areas are also present. As the macroscopic elongation increases, the oriented polymer strands are formed, whose strain is particularly high. An increase in the filler content significantly increases the number and local elongation of strands. The highest tensile loads of the filled matrix occur in the gaps with the initial size of 100 nm. The limitations of the dynamic indentation of stretched elastomers are shown.

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Impact of Filler Surface Modification on Large Scale Mechanics of Styrene Butadiene/Silica Rubber Composites

Abstract: |Macromolecules 2011, 44, 4366-4381 Macromolecules ARTICLE 2.6. Tensile Testing. Tensile tests were done with a material testing machine (Zwick 1456, Z010, Ulm, Germany) with a crosshead speed of 200 mm min À1 (ISO 527) using optical strain control.

Cited by 326 publications

References 35 publications

Viscoelastic melt rheology and time–temperature superposition of polycarbonate–multi-walled carbon nanotube nanocomposites

Viscoelastic melt rheology and time–temperature superposition of polycarbonate–multi-walled carbon nanotube nanocomposites

A coarse-grained molecular dynamics study of segmental structure and mobility in capped crosslinked copolymer films

Local elongation of stretched filled rubber surface

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