Understanding the Structure of Epoxy–Amine Interphases
Author Information
Author(s): Morsch Suzanne, Liu Yanwen, Harris Kieran, Siperstein Flor R., Di Lullo Claudio, Visser Peter, Lyon Stuart
Primary Institution: The University of Manchester
Hypothesis
How do the binding energies between amine cross-linkers and iron oxide particles affect the structure and properties of epoxy–amine interphases?
Conclusion
The study reveals that the development of chemical gradients in epoxy–amine interphases is primarily driven by the entropic segregation of unreacted materials rather than the binding strength of amines to iron oxide surfaces.
Supporting Evidence
- Electrostatic binding energies between amine cross-linkers and iron oxide particles vary significantly.
- Interfacial binding influences the level of residual amine content in the bulk matrix.
- Extensive postcure heating does not eliminate the presence of underdeveloped regions around particles.
- Chemical gradients in the interphase are primarily due to entropic segregation of unreacted materials.
Takeaway
This research shows that when making epoxy coatings, the way the materials mix and cure can create different layers that affect how strong and protective the coating is.
Methodology
The study combines molecular dynamics simulations with nanoscale infrared chemical mapping to analyze the interphase regions in epoxy–amine binders.
Limitations
The study's findings may not fully account for all variables affecting interphase development, such as different curing conditions or other types of pigments.
Digital Object Identifier (DOI)
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