Dynamics of Bottlebrush Networks
| Autor: | William F. M. Daniel, Mohammad Vatankhah-Varnosfaderani, Sergei S. Sheiko, Zhen Cao, Andrey V. Dobrynin |
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| Rok vydání: | 2016 |
| Předmět: |
Polymers and Plastics
Chemistry Organic Chemistry 02 engineering and technology Degree of polymerization 010402 general chemistry 021001 nanoscience & nanotechnology Network dynamics Elastomer 01 natural sciences 0104 chemical sciences Inorganic Chemistry Shear modulus Chemical physics Computational chemistry Materials Chemistry Kuhn length Side chain Relaxation (physics) Deformation (engineering) 0210 nano-technology |
| Zdroj: | Macromolecules. 49:8009-8017 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.6b01358 |
| Popis: | The deformation dynamics of bottlebrush networks in a melt state is studied using a combination of theoretical, computational, and experimental techniques. Three main molecular relaxation processes are identified in these systems: (i) relaxation of the side chains, (ii) relaxation of the bottlebrush backbones on length scales shorter than the bottlebrush Kuhn length (bK), and (iii) relaxation of the bottlebrush network strands between cross-links. The relaxation of side chains having a degree of polymerization (DP), nsc, dominates the network dynamics on the time scales τ0 τsc, bottlebrush elastomers behave as networks of filaments with a shear modulus G0BB(t) ∼ (nsc + 1)−1/4t–1/2. Finally, the response of the bottlebrush networks becomes time independent at... |
| Databáze: | OpenAIRE |
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