Effect of Ammonium Polyphosphate/Silicate Content on the Postfire Mechanics of Epoxy Glass-Fiber Composites Using Facile Chocolate Bar-Inspired Structures

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008957
URN to cite this document: urn:nbn:de:bvb:703-epub-8957-3

Title data

Sunder, Sruthi ; Jauregui Rozo, Maria ; Inasu, Sneha ; Meinel, Dietmar ; Schartel, Bernhard ; Ruckdäschel, Holger:
Effect of Ammonium Polyphosphate/Silicate Content on the Postfire Mechanics of Epoxy Glass-Fiber Composites Using Facile Chocolate Bar-Inspired Structures.
In: Fire and Materials. Vol. 49 (2025) Issue 3 . - pp. 329-346.
ISSN 1099-1018
DOI der Verlagsversion: https://doi.org/10.1002/fam.3280

	Format: PDF Name: Fire and Materials - 2025 - Sunder - Effect of Ammonium Polyphosphate Silicate Content on the Postfire Mechanics of Epoxy.pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
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Project information

Project title:	Project's official title Project's id Transfermechanismen vom flammgeschützten Polymerwerkstoff in den Faserkunststoffverbund: Flammschutz – Feuerwiderstand – Post-Fire Mechanik 466390889 Open Access Publizieren No information
Project financing:	Deutsche Forschungsgemeinschaft

Abstract

This study investigates the postfire mechanical properties of epoxy glass-fiber reinforced composites (EP GFRCs) using increasing concentrations of ammonium polyphosphate (APP) and inorganic silicate (InSi) to modify the char and fire residue. A facile chocolate bar-inspired structure was introduced for fire exposure and subsequent flexural testing of the GFRCs. The resin matrix used here was a diglycidyl ether of bisphenol-A (DGEBA) resin, cured with dicyandiamide (DICY), and accelerated by Urone. The microstructures of the degraded composites after three-point bending tests, were evaluated using scanning electron microscopy (SEM) and x-ray computed tomography (XCT) imaging. A previous study showed that increasing the APP and InSi content significantly enhanced flame retardancy, via improved char formation under fire conditions. However, flexural properties and fire resistance were adversely affected after fire exposure, highlighting a trade-off effect. Fiber breakage and delamination of the composites increased upon failure with increasing APP + InSi content in the composite due to unconsolidated char. The experimental values for the postfire flexural mechanics were in good agreement with the two-layer model proposed in literature. This paper presents a preliminary basis for postfire mechanical testing of epoxy composites for use in fire-safe structures, using a combination of standardized testing norms.

Further data

Item Type:	Article in a journal
DDC Subjects:	600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Polymer Materials > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Holger Ruckdäschel Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Polymer Materials
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-8957-3
Date Deposited:	06 Mar 2026 13:40
Last Modified:	06 Mar 2026 13:40
URI:	https://epub.uni-bayreuth.de/id/eprint/8957

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