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Bethke, Christian ; Goller, Sebastian M. ; Du Ngoc, Uy Lan ; Kaysser, Simon Tino ; Altstädt, Volker ; Ruckdäschel, Holger:
Tailoring Epoxy Resin Foams by Pre-Curing with Neat Amine Hardeners and Its Derived Carbamates.
In: Polymers.
Bd. 13
(2021)
Heft 8
.
- 1348.
ISSN 2073-4360
DOI: https://doi.org/10.3390/polym13081348
Volltext
Angaben zu Projekten
| Projekttitel: |
Offizieller Projekttitel Projekt-ID Particle-filled epoxy foam as new material concept for high precision abrasives and structural parts Ohne Angabe |
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| Projektfinanzierung: |
EU-Forschungsinitiative EUREKA This research was funded by the Eurostars-2 joint program with co-funding from the European Union Horizon 2020 research and innovation program with the grant number 01QE1816B. The open access charges were funded by the University of Bayreuth in the funding program Open Access Publishing. |
Abstract
The use of amine-based carbamates with their dual function, acting as amine curing agents and CO2 blowing agents after their decomposition without by-products, are promising for ecofriendly epoxy foams as high-performance materials. However, controlling cell morphology requires a proper adjustment of the viscosity at the foaming step. The viscosity is altered not only by blending neat amine and its derived carbamate at a fixed pre-curing time, but also by changing the pre-curing time at a fixed blend ratio. Within this study, diglycidylether of bisphenol A (DGEBA) epoxy resin is mixed with different blend ratios of isophorone diamine (IPDA) and its derived carbamate (B-IPDA). The systems are characterized by DSC and rheology experiments to identify the pre-curing effects on the derived epoxy foams. Epoxy foams at a blend ratio of 30/70w IPDA/B-IPDA showed the best foam morphology and an optimum Tg compared to other blend ratios. Furthermore, it was found that both pre-curing times, 2 h and 3 h, for the 30/70w IPDA/B-IPDA system reveal a more homogeneous cell structure. The study proves that the blending of neat amine and carbamate is beneficial for the foaming performance of carbamate systems.