Simultaneously enhanced fracture toughness and flame?retardant property of poly (L?lactic acid) via reactive blending with ammonium polyphosphate and in?situ formed polyurethane

» Autor: Meng Ma, Xinpeng Wang, Kai Liu, Si Chen, Yanqin Shi, Huiwen He, Xu Wang

» Referencia: doi:10.1002/pi.6053

» Fecha Publicación: 31/05/2020

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The preparation of Poly (L?lactic acid) (PLLA) with high mechanical and ideal flame retardant properties has a great challenge. Herein, a simultaneous toughness and flame?retardant PLLA composites was successfully fabricated by using a one?step process, which introduces 4, 4??methylenediphenyl diisocyanate (MDI) and ammonium polyphosphate (APP) into PLLA/Poly (??caprolactone) (PCL) blends. Scanning electron microscope (SEM), fourier transform infrared (FTIR), and thermogravimetric analyses (TG) were adapted to confirm that APP participated in the in?situ reaction during the melt process. The impact strength is increased to 13.5?kJ/m2 from 1.0?kJ/m2 for L8P2A5 composite, indicating the toughening effect of reactive blending. The cone calorimeter test, limiting oxygen index, and vertical burning test results indicate that the flame retardant properties of the composites were enhanced with the increasing of the APP contents. This work provides a method to prepare PLLA with high mechanical properties and enhanced flame retardancy.This article is protected by copyright. All rights reserved.
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