Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Cross-linker control of vitrimer flow

Author affiliations

Abstract

Vitrimers are a class of covalent adaptable networks (CANs) that undergo topology reconfiguration via associative exchange reactions, enabling reprocessing at elevated temperatures. Here, we show that cross-linker reactivity represents an additional design parameter to tune stress relaxation rates in vitrimers. Guided by calculated activation barriers, we prepared a series of cross-linkers with varying reactivity for the conjugate addition—elimination of thiols in a PDMS vitrimer. Surprisingly, despite a wide range of stress relaxation rates, we observe that the flow activation energy of the bulk material is independent of the cross-linker structure. Superposition of storage and loss moduli from frequency sweeps can be performed for different cross-linkers, indicating the same exchange mechanism. We show that we can mix different cross-linkers in a single material in order to further modulate the stress relaxation behavior.

Graphical abstract: Cross-linker control of vitrimer flow

Back to tab navigation

Supplementary files

Article information


Submitted
12 Feb 2020
Accepted
02 Apr 2020
First published
08 Apr 2020

Polym. Chem., 2020, Advance Article
Article type
Paper

Cross-linker control of vitrimer flow

B. M. El-Zaatari, J. S. A. Ishibashi and J. A. Kalow, Polym. Chem., 2020, Advance Article , DOI: 10.1039/D0PY00233J

Social activity

Search articles by author

Spotlight

Advertisements