A monomolecular organophosphate for enhancing the flame retardancy, thermostability and crystallization properties of polylactic acid

Abstract

Polylactic acid (PLA) is regarded as one of the most promising bioplastics. However, its inherent high flammability of PLA seriously limits its application in the emerging fields. Although the traditional phosphate flame retardants showed excellent flame retardant efficiency in PLA, they often failed to meet the processing requirements of PLA and the thermal stability of PLA composites was decreased after their addition. Herein, an organophosphate flame retardant pentaerythritol bis(phenyl phosphonate) (PBPP) with high thermal stability and phosphorus content was synthesized by the nucleophilic substitution reaction in our laboratory. The introduction of PBPP simultaneously improved the flame retardancy, thermostability and crystallization properties of PLA. Only 3 wt% PBPP endowed PLA composites with UL‐94 V‐0 grade and higher LOI of 28.3% due to its excellent gas phase effect. Moreover, the crystallinity of PLA/PBPP4 was enhanced from 14.2% of PLA to 32.2% with the improvement of 127%. Because of the similar structure and good compatibility between organophosphate flame retardant and PLA matrix, flame retardant PLA/PBPP maintained almost the same strength as neat PLA. This study provided a novel way for the preparation of a high‐performance flame retardant PLA composites with excellent comprehensive properties and it was important to expand the application value of multifunctional PLA materials.

Facile and Bioinspired Approach from Gallic Acid for the Synthesis of Biobased Flame Retardant Coatings of Basalt Fibers

“…The PLA/BF-FeP composite showed no change in TSP. Studies are reported in the literature detecting an increase in TSP when phenyl phosphonate FRs are used due to the production of phosphorus free radicals acting in the gas phase. − The efficacy of the developed FR coating is noteworthy, given its low loading on the fiber surface, as it successfully mitigated smoke production without compromising its FR capabilities. Consistent with the TGA and MP-AES results, the low FR loading on the fibers does not lead to an appreciable decrease in the mass loss attributable to char production.…”

Pultrusion preparation and properties of continuous glass fiber reinforced polylactic acid thermoplastic composites

“…Polylactic acid (PLA) is a kind of thermoplastic polymer produced from lactic acid, which has been successfully utilized in biodegradable material and as a composite matrix material. [30][31][32][33][34] In addition, PLA is a promising and prominent biomaterial that has been widely used to replace the traditional petrochemicalbased polymers in various applications because of the environmental concerns and relatively good mechanical properties. 35 Especially green thermoplastic composites have gained greater attention as ecological consciousness has grown to be more appealing than conventional toxic and nonbiodegradable petroleum-based composites.…”

“…Polylactic acid (PLA) is a kind of thermoplastic polymer produced from lactic acid, which has been successfully utilized in biodegradable material and as a composite matrix material 30–34 . In addition, PLA is a promising and prominent biomaterial that has been widely used to replace the traditional petrochemical‐based polymers in various applications because of the environmental concerns and relatively good mechanical properties 35 .…”