Competition in aluminium phosphinate-based halogen-free flame retardancy of poly (butylene terephthalate) and its glass-fibre composites

Abstract: Aluminium diethylphosphinate (AlPi-Et) and inorganic aluminium phosphinate with resorcinol-bis (di-2,6-xylyl phosphate) (AlPi-H+RXP) were compared with each other as commercially available halogen-free flame retardants in poly (butylene terephthalate) (PBT) as well as in glass-fibre-reinforced PBT (PBT/GF). Pyrolysis behaviour and flame retardancy performance are reported in detail. AlPi-H+RXP released phosphine at very low temperatures, which can become a problem during processing. AlPi-Et provided better limiting oxygen index (LOI) values and UL 94 ratings for bulk and PBT/GF than AlPi-H+RXP. Both flame retardants acted via three different flame-retardancy mechanisms in bulk as well as in PBT/GF, namely, flame inhibition, increased amount of char, and a protection effect of the char. AlPi-Et was more efficient in decreasing the total heat evolved of PBT in the cone calorimeter test. AlPi-H+RXP reduced the peak heat release rate of PBT more efficiently than AlPi-Et. An optimum loading of AlPi-Et in PBT/GF was found, which was below the supplier’s recommendation. This loading provides a maximum increase in LOI and a maximum decrease in total heat evolved.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Competition in aluminium phosphinate-based halogen-free flame retardancy of poly (butylene terephthalate) and its glass-fibre composites ; volume:14 ; number:3 ; year:2014 ; pages:193-208 ; extent:16 ; e-Polymers ; 14, Heft 3 (2014), 193-208 (gesamt 16)

Contributors, Places and Time

• Creator: Brehme, Sven ; Köppl, Thomas ; Schartel, Bernhard ; Altstädt, Volker

Further information

• DOI: 10.1515/epoly-2014-0029
• URN: urn:nbn:de:101:1-2412151514354.031152596946
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:29 AM CEST