ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
3 files

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

preprint
revised on 23.03.2021, 02:50 and posted on 23.03.2021, 13:22 by Jacob Ishibashi, Ian Pierce, Alice Chang, Aristotelis Zografos, Bassil El-Zaatari, Yan Fang, Steven Weigand, Frank S. Bates, Julia Kalow

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.


Funding

NSF CHE-1901635

History

Email Address of Submitting Author

jkalow@northwestern.edu

Institution

Northwestern University

Country

United States

ORCID For Submitting Author

0000-0002-4449-9566

Declaration of Conflict of Interest

The authors declare no conflict of interest.

Exports

ChemRxiv

Exports