Abstract
Dibutyl-lignosulfonamide (DBA), N-butyl-N-dodecyl-lignosulfonamide (NNA) and didodecyl-lignosulfonamide (DDA) were used as halogen-free flame retardants (HFFR) of PLA. Lignosulfonamides were used in amounts of 3, 6 and 9 wt%. The composites were analyzed by TGA, DSC and micro-combustion calorimetry (MCC). Lignosulfonamides were shown to reduce PLA flammability by up to 40%. The lowest flammability was obtained with the highest HFFR content. The reduction in flammability can be explained by the release of SO2 at the early stage of biocomposite decomposition, which promotes the formation of coke and char, acting as a local insulator.
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