POS7-0213
Vinylogous Urethane and Disulfide Dual-dynamic Epoxy Vitrimer with Rapid Stress Relaxation and Multiple Recycling Routes
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
hu xu (sichuan university)
Co-Author(s)
Abstract
As a new class of covalently cross-linked materials, vitrimers integrate superior mechanical performance with excellent reprocessability through the incorporation of dynamic covalent bonds. These dynamic bonds undergo exchange reactions under external stimuli, enabling reorganization of the networks. Since the topological rearrangement of vitrimers mostly depends on dynamic bond exchange, simply incorporating flexible chains does not significantly alter the exchange rate. Therefore, to substantially accelerate network rearrangement, a dual functional epoxy vitrimer with multiple recycling routes is prepared by curing diglycidyl ether of bisphenol F (DGEBF) with cystamine. The resulting vitrimer shows not only high Tg (＞70 ℃), tensile strength (＞90 MPa) and Young’s modulus (>2000 MPa), but also rapid stress relaxation, with a relaxation time of 11 s at 110 ℃. Furthermore, due to the incorporation of disulfide bonds, the cured material can be recycled via dithiothreitol (DTT)-mediated degradation. This approach also validated the potential for filler recovery in composite applications, providing a simple strategy for fabricating high-performance epoxy composites.
