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Issue 22, 2018
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A facile access to stiff epoxy vitrimers with excellent mechanical properties via siloxane equilibration

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Abstract

A new high performance stiff epoxy vitrimer based on siloxane equilibration has been fabricated in a simple way in which a polysiloxane oligomer containing aminopropyl side groups and catalytic potassium silanolate end groups was synthesized and used as a curing agent. The viscoelastic properties of the cured epoxy can be controlled by varying the concentration of potassium silanolate groups and the vitrimer possessing a complete stress relaxation behavior can be prepared, with relaxation times ranging from 376.8 s at 90 °C to 40.2 s at 170 °C. Due to the dynamic siloxane equilibration of polysiloxane catalyzed by potassium silanolate groups, this epoxy vitrimer exhibits excellent self-healing and recycling abilities. It can self-repair with a high healing efficiency, and be recycled at 130 °C within 40 min, retaining its original mechanical and thermal properties after at least four recycling cycles. Furthermore, such a material exhibits simultaneously a high service temperature (a glass transition temperature of 83 °C and an initial degradation temperature of 358 °C) and a strong (a stress at break of 46.6 MPa) and stiff (Young's modulus of 2.2 GPa) nature.

Graphical abstract: A facile access to stiff epoxy vitrimers with excellent mechanical properties via siloxane equilibration

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Article information


Submitted
06 Mar 2018
Accepted
04 May 2018
First published
11 May 2018

J. Mater. Chem. A, 2018,6, 10184-10188
Article type
Communication

A facile access to stiff epoxy vitrimers with excellent mechanical properties via siloxane equilibration

X. Wu, X. Yang, R. Yu, X. Zhao, Y. Zhang and W. Huang, J. Mater. Chem. A, 2018, 6, 10184
DOI: 10.1039/C8TA02102C

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