Mechanical and structural consequences of associative dynamic cross-linking in acrylic diblock copolymers

23 March 2021, Version 5
This content is a preprint and has not undergone peer review at the time of posting.

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.


Keywords

block copolymers
vitrimers
covalent adaptable networks

Supplementary materials

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Ishibashi SI revision
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