Thermal decomposition mechanism of F-3020, end-capped brominated epoxy flame retardant

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This contribution investigates the mechanism of thermal decomposition of end-capped epoxy oligomers of tetrabromobisphenol A (TBBPA), denoted as F-3020, commonly deployed to control flammability of styrenic polymers. The aim is to assist with the development of co-pyrolysis processes for recycling plastics containing brominated flame retardants (BFR).
The experiments combine thermogravimetric analysis and differential scanning calorimetry, with attenuated total reflectance of the residue and on-line infrared analysis of pyrolysis gases and. F-3020 decomposes in three stages including, (Stage 1) volatilisation that commences at around 260 °C, followed (Stage 2) by dissociation of ether linkages, with the accompanying emission of 2,4,6-tribromophenol (from end caps) and methane and acetone (from hydroxypropanediyl linkages). Stage 2 also includes the formation of CH3Br and HBr from intramolecular reactions. The rate of pyrolysis in Stage 2 peaks at around 360 °C. Stage 3 commences at around 412 °C and releases debrominated or partly-debrominated fragments of F-3020, with declining discharge of CO2, CO and H2O, and ceased release of CH4 and CH3COCH3. The present measurements suggest that success of the co-pyrolysis process will depend on the effectiveness of inorganic adsorbers for fixing HBr and for debrominating CH3Br, bromophenols and volatilised molecules of F-3020 at temperatures as low as 260 °C.
Original languageEnglish
Title of host publicationTowards Clean Combustion and Decarbonisation
Subtitle of host publicationProceedings of Australian Combustion Symposium 2023
EditorsBogdan Z. Dlugogorski , Assaad R. Masri
Place of PublicationDarwin, Northern Territory
PublisherCharles Darwin University
Number of pages4
Publication statusE-pub ahead of print - 2023
EventAustralian Combustion Symposium -
Duration: 1 Jan 2011 → …

Publication series

NameProceedings of the Australian Combustion Symposium
PublisherCharles Darwin University
ISSN (Electronic)1839-8162


ConferenceAustralian Combustion Symposium
Period1/01/11 → …


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