What is it about?
Herein, a sustainable in situ solid-phase polycondensation strategy has been used to prepare a lignin-based fire retardant, Lig-APP, by grafting ammonium polyphosphate onto lignin without using any organic solvent.
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Why is it important?
Polylactic acid (PLA) exhibits intrinsic high flammability, inadequate toughness and UV resistance, which impedes its adoption into novel industry sectors. Although lignin-based fire retardants have shown high efficiency in PLA, their poor interfacial compatibility with PLA deteriorates mechanical properties and the preparation often involves use of plethora of organic solvents.
Perspectives
As-synthesized Lig-APP has shown an increased charring ability and excellent fire retardancy in PLA. With only 3 wt% loading of Lig-APP, PLA achieved a UL94 V-0 rating and a limiting oxygen index (LOI) of 27.6 %. Moreover, Lig-APP simultaneously strengthened and toughened PLA while increasing the UV resistance of PLA. This work opens an innovative eco-benign avenue to create biobased fire retardants and high-performance PLA biocomposites.
Dr Pratheep K Annamalai
University of Queensland
Read the Original
This page is a summary of: Functionalizing lignin by in situ solid-phase grafting ammonium polyphosphate for enhancing thermal, flame-retardant, mechanical, and UV-resistant properties of polylactic acid, Chemical Engineering Journal, September 2024, Elsevier,
DOI: 10.1016/j.cej.2024.153429.
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