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Phosphorylation of lignin to flame retard acrylonitrile butadiene styrene (ABS)

: Prieur, B.; Meub, M.; Wittemann, M.; Klein, Roland; Bellayer, S.; Fontaine, G.; Bourbigot, S.


Polymer degradation and stability 127 (2016), S.32-43
ISSN: 0141-3910
Eurofillers-Polymer Blends Conference (EPB) <2015, Montpellier>
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer LBF ()
Lignin; ABS; lignin modification; flame retardancy; thermal degradation; phosphorus

Lignin is an abundant polyphenol biopolymeric material. Due to its aromatic structure it develops a char under fire conditions. Lignin was used as flame retardant in acrylonitrile-butadiene-styrene (ABS). Enhancement of flame retardancy was observed, and the lignin was then phosphorylated to achieve highest performance. For the first time, characterization of FR phosphorylated lignin (P-LIG) was undertaken in detail. Grafting phosphorus onto lignin significantly increases the amount of residue from the polymer blend at high temperature. At 30 wt.%, P-LIG is well dispersed in ABS and leads to a significant reduction of the peak of heat release rate. It is shown that P-LIG promotes char formation by reacting with ABS during thermal decomposition. The char is therefore more cohesive and acts as a protective layer, such that less fuel from ABS degradation is released to the flame. Thus phosphorylated lignin is as a promising bio-based flame retardant for ABS.