Abstract
The composition of low-Tg n-butylacrylate-block-(acetoxyaceto)ethyl acrylate block polymers is investigated as a strategy to tune the properties of dynamically cross-linked vinylogous urethane vitrimers. As the proportion of the cross-linkable block is increased, the thermorheological properties, structure, and stress relaxation evolve in ways that cannot be explained by increasing cross-link density alone. Evidence is presented that network connectivity defects such as loops and dangling ends are increased by microphase separation. The thermomechanical and viscoelastic properties of block-copolymer-derived vitrimers arise from the subtle interplay of microphase separation and network defects.
Original language | English (US) |
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Pages (from-to) | 3972-3986 |
Number of pages | 15 |
Journal | Macromolecules |
Volume | 54 |
Issue number | 9 |
DOIs | |
State | Published - May 11 2021 |
Bibliographical note
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