We numerically investigate the self-dynamics and collective dynamics of a simple model for vitrimers - polymeric covalent networks that have the ability to dynamically rearrange the bond structure via exchange reactions, preserving the total connectivity. Specifically, we study a binary mixture of tetrafunctional and bifunctional particles by means of molecular dynamics simulations that naturally incorporate the bond-swapping mechanism. We specifically focus on the dynamics at small wavevector q by simulating 800 »000 particles. We observe two distinct collective relaxation processes: (i) a fast vibrational damped mode and (ii) a slow network restructuring dynamics. Unexpectedly, the slow process is characterized by a wavevector-independent (q0) mode originating from the swap motion of the bonds.
Self-Dynamics and Collective Swap-Driven Dynamics in a Particle Model for Vitrimers / Rovigatti, Lorenzo; Nava, Giovanni; Bellini, Tommaso; Sciortino, Francesco. - In: MACROMOLECULES. - ISSN 0024-9297. - 51:3(2018), pp. 1232-1241. [10.1021/acs.macromol.7b02186]
Self-Dynamics and Collective Swap-Driven Dynamics in a Particle Model for Vitrimers
Lorenzo Rovigatti;Francesco Sciortino
2018
Abstract
We numerically investigate the self-dynamics and collective dynamics of a simple model for vitrimers - polymeric covalent networks that have the ability to dynamically rearrange the bond structure via exchange reactions, preserving the total connectivity. Specifically, we study a binary mixture of tetrafunctional and bifunctional particles by means of molecular dynamics simulations that naturally incorporate the bond-swapping mechanism. We specifically focus on the dynamics at small wavevector q by simulating 800 »000 particles. We observe two distinct collective relaxation processes: (i) a fast vibrational damped mode and (ii) a slow network restructuring dynamics. Unexpectedly, the slow process is characterized by a wavevector-independent (q0) mode originating from the swap motion of the bonds.File | Dimensione | Formato | |
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