Study on the temperature dependence of the bulk modulus of polyisoprene by molecular dynamics simulations

Diani, Julie; Fayolle, Bruno; Pierre, Guillaume

doi:10.1080/08927020801993388

Cited by 18 publications

(13 citation statements)

References 17 publications

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“…Let us recall Young’s modulus can be related to the crosslink density, whereas bulk modulus is essentially controlled by van der Waals forces [ 26 , 27 ]. Chemical degradation yielding a crosslinking process does not modify significantly the van der Waals’ energy.…”

Section: Resultsmentioning

confidence: 99%

Elastic Properties of Polychloroprene Rubbers in Tension and Compression during Ageing

Bouaziz

Truffault

Borisov³

et al. 2020

Polymers

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Being able to predict the lifetime of elastomers is fundamental for many industrial applications. The evolution of both tensile and compression behavior of unfilled and filled neoprene rubbers was studied over time for different ageing conditions (70 °C, 80 °C and 90 °C). While Young’s modulus increased with ageing, the bulk modulus remained almost constant, leading to a slight decrease in the Poisson’s ratio with ageing, especially for the filled rubbers. This evolution of Poisson’s ratio with ageing is often neglected in the literature where a constant value of 0.5 is almost always assumed. Moreover, the elongation at break decreased, all these phenomena having a similar activation energy (~80 kJ/mol) assuming an Arrhenius or pseudo-Arrhenius behavior. Using simple scaling arguments from rubber elasticity theory, it is possible to relate quantitatively Young’s modulus and elongation at break for all ageing conditions, while an empirical relation can correlate Young’s modulus and hardness shore A. This suggests the crosslink density evolution during ageing is the main factor that drives the mechanical properties. It is then possible to predict the lifetime of elastomers usually based on an elongation at break criterion with a simple hardness shore measurement.

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Section: Resultsmentioning

confidence: 99%

Elastic Properties of Polychloroprene Rubbers in Tension and Compression during Ageing

Bouaziz

Truffault

Borisov³

et al. 2020

Polymers

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show abstract

“…One may note that the interphase behaves as the rubber matrix when x = 1, and that the interphase behavior is elastic and coincides with the rubber matrix in the glassy state when x = 0. The bulk modulus of the interphase is assumed constant and equal to the rubber matrix bulk modulus, since one does not expect a significant change in this modulus with a reduced chain mobility (Diani et al, 2008). In order to run the 4-phase model, two unknowns remain: the interphase volume fraction f i and its behavior, which is now characterized by the x parameter.…”

Section: Account For a Filler-matrix Interphasementioning

confidence: 99%

Micromechanical modeling of the linear viscoelasticity of carbon-black filled styrene butadiene rubbers: The role of the filler–rubber interphase

Diani

Pierre

Merckel

et al. 2013

Mechanics of Materials

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Micromechanics modeling of the linear viscoelasticity of carbon-black filled styrene butadiene rubbers (SBR) shows that a simple representation of a spherical rigid-phase surrounded by rubber gum and embedded in an homogeneous equivalent medium provides access to the effective volume fraction of fillers. This simple representation is successful for a significant range of filler amount, and for materials in the glassy state. For materials in the rubbery state, experimental results support the existence of a filler-rubber interphase with reduced mobility due to confinement. The 4-phase micromechanics model, which accounts for a bounded rubber layer coating the fillers, provides satisfactory estimates of the linear viscoelasticity of filled rubbers from the rubbery state to the glassy state. It also provides access to the fillerrubber interphase behavior that appears viscoelastic, and to an estimate of the interphase thickness.

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“…Note that albeit the bulk modulus of the SBR does change through the glass transition, this approximation is fairly reasonable when focusing on the viscoelastic shear modulus. Actually, this assumption is supported by the fact that in polymer networks, the bulk modulus results mainly from van der Waals interactions and not from entropy change (Diani et al, 2008). Then, assuming that the viscoelastic shear modulus of the interphase is enhanced compared to the viscoelastic shear modulus of the bulk gum shown in Fig.…”

Section: Materials and Behaviormentioning

confidence: 58%

Using a pattern-based homogenization scheme for modeling the linear viscoelasticity of nano-reinforced polymers with an interphase

Diani

Pierre

2014

Journal of the Mechanics and Physics of Solids

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe self-consistent model based on morphological representative patterns is applied to the realistic case of the linear viscoelasticity of polymers reinforced by elastic nano-particles coated with a viscoelastic interphase. This approach allows to study the effect of such microstructure parameters as particle dispersion, particle size distribution and interparticle distance distribution. Under the assumption that the interphase has the same thickness around all reinforcing particles, it is shown that the particle size distribution has little effect on the effective properties of the heterogeneous material, whereas the particle dispersion and the interparticle distance distribution have stronger impacts.

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Study on the temperature dependence of the bulk modulus of polyisoprene by molecular dynamics simulations

Cited by 18 publications

References 17 publications

Elastic Properties of Polychloroprene Rubbers in Tension and Compression during Ageing

Elastic Properties of Polychloroprene Rubbers in Tension and Compression during Ageing

Micromechanical modeling of the linear viscoelasticity of carbon-black filled styrene butadiene rubbers: The role of the filler–rubber interphase

Using a pattern-based homogenization scheme for modeling the linear viscoelasticity of nano-reinforced polymers with an interphase

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