Klitsch, Johannes ; Pfaendner, Rudolf ; Fasel, Claudia ; Schönberger, Frank (2022):
Mode of Action of Zn-DOPOx and Melamine Polyphosphate as Flame Retardants in Glass Fiber-Reinforced Polyamide 66. (Publisher's Version)
In: Polymers, 14 (18), MDPI, e-ISSN 2073-4360,
DOI: 10.26083/tuprints-00022484,
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Item Type: | Article |
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Origin: | Secondary publication DeepGreen |
Status: | Publisher's Version |
Title: | Mode of Action of Zn-DOPOx and Melamine Polyphosphate as Flame Retardants in Glass Fiber-Reinforced Polyamide 66 |
Language: | English |
Abstract: | In this study, the flame retardant effect of the Zn salt of 10-hydroxy-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (Zn-DOPOx), melamine polyphosphate (MPP) and their mixture was investigated towards the mode of action in glass fiber-reinforced polyamide 66 (PA 66 GF). The flammability was evaluated using UL 94 V and cone calorimetry. Influence on char formation was analyzed by SEM. Thermal decomposition of Zn-DOPOx and MPP was studied by TGA and ATR-FTIR. The release of gaseous PA 66 decomposition products was investigated using TGA-DTA-FTIR. Combining Zn-DOPOx and MPP leads to an improvement in flame retardancy, most pronounced for equal parts of weight. Mode of action changes significantly for Zn-DOPOx:MPP (1:1) compared to the sole components and a strong interaction between Zn-DOPOx and MPP is revealed, resulting in a more open char structure. Fuel dilution as well as less exothermic decomposition are essential for the mode of action of the combination. Through low HRR values and high CO/CO₂ ratio during cone calorimetry measurements, a significant increase in gas phase activity was proven. Therefore, it is concluded that Zn-DOPOx:MPP (1:1) leads to a significant increase in flame retardancy through a combination of mode of actions in the gas and condensed phase resulting from the change in thermal stability. |
Journal or Publication Title: | Polymers |
Volume of the journal: | 14 |
Issue Number: | 18 |
Place of Publication: | Darmstadt |
Publisher: | MDPI |
Collation: | 19 Seiten |
Uncontrolled Keywords: | flame retardant, PA 66, phosphorus-containing flame retardant, metal phosphorous salt, halogen-free |
Classification DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie |
Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Structure Research |
Date Deposited: | 10 Oct 2022 12:36 |
Last Modified: | 12 Oct 2022 05:34 |
DOI: | 10.26083/tuprints-00022484 |
Corresponding Links: | |
URN: | urn:nbn:de:tuda-tuprints-224846 |
Additional Information: | This article belongs to the Special Issue Advances in Flame Retardant Polymeric Materials II |
SWORD Depositor: | Deep Green |
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/22484 |
PPN: | 500262292 |
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