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Article

Tailoring Epoxy Resin Foams by Pre-Curing with Neat Amine Hardeners and Its Derived Carbamates

1
Department of Polymer Engineering, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany
2
Bavarian Polymer Institute and Bayreuth Institute of Macromolecular Research, University of Bayreuth, Universitaetsstrasse 30, 95447 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Sharing first authorship.
Academic Editor: Keon-Soo Jang
Polymers 2021, 13(8), 1348; https://doi.org/10.3390/polym13081348
Received: 25 March 2021 / Revised: 12 April 2021 / Accepted: 19 April 2021 / Published: 20 April 2021
(This article belongs to the Special Issue Advanced Epoxy-Based Materials)
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. View Full-Text
Keywords: epoxy foam; thermoset foam; carbamate; pre-curing; batch foaming; rheology; DSC epoxy foam; thermoset foam; carbamate; pre-curing; batch foaming; rheology; DSC
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MDPI and ACS Style

Bethke, C.; Goller, S.M.; Ngoc, U.L.D.; Kaysser, S.T.; Altstädt, V.; Ruckdäschel, H. Tailoring Epoxy Resin Foams by Pre-Curing with Neat Amine Hardeners and Its Derived Carbamates. Polymers 2021, 13, 1348. https://doi.org/10.3390/polym13081348

AMA Style

Bethke C, Goller SM, Ngoc ULD, Kaysser ST, Altstädt V, Ruckdäschel H. Tailoring Epoxy Resin Foams by Pre-Curing with Neat Amine Hardeners and Its Derived Carbamates. Polymers. 2021; 13(8):1348. https://doi.org/10.3390/polym13081348

Chicago/Turabian Style

Bethke, Christian, Sebastian Manfred Goller, Uy Lan Du Ngoc, Simon Tino Kaysser, Volker Altstädt, and Holger Ruckdäschel. 2021. "Tailoring Epoxy Resin Foams by Pre-Curing with Neat Amine Hardeners and Its Derived Carbamates" Polymers 13, no. 8: 1348. https://doi.org/10.3390/polym13081348

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