Polylactic acid (PLA) is highly attractive as biodegradable material for alternative petroleum-based plastics but is restricted by its inherent flammability. One promising strategy is to develop green efficient fire retardants without sacrificing the mechanical property of PLA. Polyphosphoramides are the most representative, but their synthetic progresses are complicated and involve the use of a large volume of organic solvents. Herein, we synthesized a novel ultra-efficient triazine-containing polyphosphoramide (PPE) using a facile one-pot solvent-free method. The resultant 0.5 PPE/PLA exhibits supremely outstanding flame retardancy to PLA with a satisfactory V-0 rating and 26.1% of LOI, better than most of the current flame retardants because of the co-operative effect of gas and condensed phases. Moreover, the 0.5 PPE/PLA composite displays increased impact strength, toughness, and well-preserved strength and modulus of pure PLA. This work provides an eco-benign and mass-produced approach to design efficient yet excellent comprehensive performance flame retardant for bio-plastics, which looks forward to accelerating the application of bio-plastics in industry.

One-pot, solvent-free green strategy to fabricate ultra-efficient polyphosphoramide flame retardant for poly(lactic acid)

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ACS Fall 2022

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