Journal
POLYMER DEGRADATION AND STABILITY
Volume 127, Issue -, Pages 32-43Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2016.01.015
Keywords
Lignin; ABS; Lignin modification; Flame retardancy; Thermal degradation; Phosphorus
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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. (C) 2016 Elsevier Ltd. All rights reserved.
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