| Autor: |
Ciarella S; Department of Applied Physics, Eindhoven University of Technology, Postbus 513, NL-5600 MB Eindhoven, Netherlands., Sciortino F; Department of Physics and CNR-ISC, Sapienza Universitá di Roma, Piazzale Aldo Moro 2, I-00185 Roma, Italy., Ellenbroek WG; Department of Applied Physics, Eindhoven University of Technology, Postbus 513, NL-5600 MB Eindhoven, Netherlands.; Institute for Complex Molecular Systems, Eindhoven University of Technology, Postbus 513, NL-5600 MB Eindhoven, Netherlands. |
| Abstrakt: |
We propose a coarse-grained model to investigate stress relaxation in star-polymer networks induced by dynamic bond-exchange processes. We show how the swapping mechanism, once activated, allows the network to reconfigure, exploring distinct topological configurations, all of them characterized by complete extent of reaction. Our results reveal the important role played by topological defects in mediating the exchange reaction and speeding up stress relaxation. The model provides a representation of the dynamics in vitrimers, a new class of polymers characterized by bond-swap mechanisms which preserve the total number of bonds, as well as in other bond-exchange materials. |
