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Effect of Resin and Blocked/Unblocked Hardener Mixture on the Production of Epoxy Foams with CO₂ Blocked Hardener in Batch Foaming Process

Title data

Bethke, Christian ; Sanchez-Vazquez, Sandra A. ; Raps, Daniel ; Bakis, Gökhan ; Bard, Simon ; Du Ngoc, Uy Lan ; Altstädt, Volker:
Effect of Resin and Blocked/Unblocked Hardener Mixture on the Production of Epoxy Foams with CO₂ Blocked Hardener in Batch Foaming Process.
In: Polymers. Vol. 11 (2019) Issue 5 . - No. 793.
ISSN 2073-4360
DOI: https://doi.org/10.3390/polym11050793

Official URL: Volltext

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Project financing: Andere

Abstract in another language

The present study focuses on the processing and properties of epoxy foams by the use of CO2 blocked hardener N-aminoethylpiperazine (B-AEP) and different resins. Although some studies described the foaming with carbamates, little attention has been given to the interaction of resin properties (such as viscosity) on the foaming performance. Therefore, two resins, diglycidyl ether of bisphenol-A (DGEBA) and epoxy novolac (EN), as well as their 50:50 blend, were foamed with B-AEP and unblocked/blocked AEP hardener mixtures in a batch foaming process. Furthermore, the commercially available chemical blowing agent para-toluenesulfonyl hydrazide (TSH) was used as a benchmark for commonly used chemical blowing agents. The lowest density in this study was reached by the DGEBA+B-AEP system in the range of 215 kg/m3 with the drawback of an inhomogeneous cell structure and high cell size distribution. The best cell morphology and lowest cell size distribution was reached with the EN+15:85% unblocked:blocked hardener mixture, resulting in a density in the range of 394 kg/m3. A syntactic foam was achieved by a DGEBA+50:50% unblocked:blocked hardener mixture with a density of around 496 kg/m3. It was found that a higher viscosity of the resin lead to an increase in the density and a decrease in the cell size distribution range as a result of a closer expansion time window.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: epoxy foam; carbamate; CO2 foaming; epoxy resin; batch foaming; structural foam
1. Introduction
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Former Professors
Faculties > Faculty of Engineering Science > Chair Polymer Materials
Faculties > Faculty of Engineering Science > Former Professors > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Volker Altstädt
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 28 Mar 2020 22:00
Last Modified: 01 Feb 2022 07:47
URI: https://eref.uni-bayreuth.de/id/eprint/54736