Abstract
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...
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