Hyper-Auxeticity and the Volume Phase Transition of Polymer Gels
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866911972151263232 |
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| author | Ninarello, Andrea Zaccarelli, Emanuela |
| author_facet | Ninarello, Andrea Zaccarelli, Emanuela |
| contents | Thermoresponsive hydrogels exhibit reversible deswelling at the Volume Phase Transition (VPT), associated to a minimum of the Poisson's ratio $ν$. Recent numerical investigations uncovered the occurrence of a Hyper-Auxetic Transition (HAT) ($ν=-1$) for low-crosslinked hydrogels at low temperature, accompanied by a critical-like behavior. Here, we perform extensive numerical simulations to unveil the relation between these two transitions. We find that the HAT occurs at different temperatures $T$ up to a maximum value of the crosslinker concentration $c$, thus being clearly distinct from the VPT, taking place at fixed $T$ and for all $c$. Our results provide novel fundamental insights on the interplay between network collapse and mechanical properties of these fascinating materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20821 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Hyper-Auxeticity and the Volume Phase Transition of Polymer Gels Ninarello, Andrea Zaccarelli, Emanuela Soft Condensed Matter Thermoresponsive hydrogels exhibit reversible deswelling at the Volume Phase Transition (VPT), associated to a minimum of the Poisson's ratio $ν$. Recent numerical investigations uncovered the occurrence of a Hyper-Auxetic Transition (HAT) ($ν=-1$) for low-crosslinked hydrogels at low temperature, accompanied by a critical-like behavior. Here, we perform extensive numerical simulations to unveil the relation between these two transitions. We find that the HAT occurs at different temperatures $T$ up to a maximum value of the crosslinker concentration $c$, thus being clearly distinct from the VPT, taking place at fixed $T$ and for all $c$. Our results provide novel fundamental insights on the interplay between network collapse and mechanical properties of these fascinating materials. |
| title | Hyper-Auxeticity and the Volume Phase Transition of Polymer Gels |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2407.20821 |