Reversed dynamics of bottlebrush polymers with stiff backbone and flexible side chains.
| Autor: | Jakobi B; Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA., Bichler KJ; Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA., Juranyi F; Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen, Switzerland., Schneider GJ; Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA.; Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA. |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of chemical physics [J Chem Phys] 2024 Feb 28; Vol. 160 (8). |
| DOI: | 10.1063/5.0184429 |
| Abstrakt: | The segmental dynamics of bottlebrush polymers with a stiff backbone and flexible side chains has been studied. The segmental relaxation time of side chains attached to a flexible backbone follows the same trend as linear polymers, an increase with the increasing molecular weight, but is slowed down compared to their linear counterparts. Theoretical work predicts a reversal of the molecular weight dependence of the relaxation time for stiff backbones. As a model for a stiff-g-flexible system, bottlebrushes with poly(norbornene) backbone and poly(propylene oxide) side chains, PNB-g-PPO, at a uniform grafting density have been synthesized and characterized with quasi-elastic neutron scattering. Indeed, the anticipated reversed dynamics was found. Increasing the side chain length decreases the segmental relaxation time. This indicates the importance of the characteristics of the grafting site beyond a simplified picture of an attached side chain. The mean square displacement shows a similar trend with longer side chains exhibiting a larger displacement. (© 2024 Author(s). Published under an exclusive license by AIP Publishing.) |
| Databáze: | MEDLINE |
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