Central role of filler-polymer interplay in nonlinear reinforcement of elastomeric nanocomposites
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| Format: | Preprint |
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2023
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| _version_ | 1866916565180481536 |
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| author | Kawak, Pierre Bhapkar, Harshad Simmons, David S. |
| author_facet | Kawak, Pierre Bhapkar, Harshad Simmons, David S. |
| contents | Nanoparticles can greatly enhance the mechanical response of elastomeric polymers essential to a wide range of applications, yet their precise molecular mechanisms of high-strain reinforcement remain largely unresolved. Here we show, based on molecular dynamics simulations, that high-strain reinforcement emerges from an interplay between granular nanoparticulate compressive behavior in the normal direction and polymer incompressibility. This feedback loop, which is initiated by a mismatch in the Poisson ratios of nanofiller and polymer, invokes a contribution from the polymer's bulk modulus to the elongational stress, while the tendency of the polymer to contract in the normal direction maintains a near-jammed filler state. This effect persists even once the direct filler elongational contribution becomes dissipative after the 'Payne effect' yield. These results indicate that direct particle-particle contact effects, even in the absence of potential augmenting mechanisms such as glassy polymer bridges, can drive the mechanical reinforcement effects typical of experimental systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_18433 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Central role of filler-polymer interplay in nonlinear reinforcement of elastomeric nanocomposites Kawak, Pierre Bhapkar, Harshad Simmons, David S. Soft Condensed Matter Mesoscale and Nanoscale Physics Materials Science Nanoparticles can greatly enhance the mechanical response of elastomeric polymers essential to a wide range of applications, yet their precise molecular mechanisms of high-strain reinforcement remain largely unresolved. Here we show, based on molecular dynamics simulations, that high-strain reinforcement emerges from an interplay between granular nanoparticulate compressive behavior in the normal direction and polymer incompressibility. This feedback loop, which is initiated by a mismatch in the Poisson ratios of nanofiller and polymer, invokes a contribution from the polymer's bulk modulus to the elongational stress, while the tendency of the polymer to contract in the normal direction maintains a near-jammed filler state. This effect persists even once the direct filler elongational contribution becomes dissipative after the 'Payne effect' yield. These results indicate that direct particle-particle contact effects, even in the absence of potential augmenting mechanisms such as glassy polymer bridges, can drive the mechanical reinforcement effects typical of experimental systems. |
| title | Central role of filler-polymer interplay in nonlinear reinforcement of elastomeric nanocomposites |
| topic | Soft Condensed Matter Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2310.18433 |