Poly(lactic acid) Flame Retarded by Phosphazene-triazine Bi-groups Compound

doi:10.19491/j.issn.1001-9278.2018.03.012

Abstract

Abstract: A novel flame retardant based on phosphazene and triazine groups (HTTCP) was used to modify poly(lactic acid) (PLA) by a combination of hexaphenoxycyclotriphosphazene (HPCTP) and pentaerythritol octahydrogen tetraphosphate (PEPA) via a melt blending method. Thermogravimetric analysis, limiting oxygen index (LOI), vertical burning experiment and cone calorimetry were conducted to investigate the effect of different flame retardants and their weight ratios on thermal stability and flame retardant properties of PLA matrix composites. Moreover, the morphology of residual char was analyzed by scanning electron microscopy, and the flameretardant mechanisms were investigated. The results indicated that PEPA/HTTCP system exhibited a better flameretardant effect on HPCTP/HTTCP one due to its excellent protective and barrier effect. The composites gained a maximum LOI of 27.2 vol % with the addition of 20 wt % flame retardants at PEPA and HTTCP mass ratio of 3∶1. Furthermore, their heat release rate, average heat release rate and total heat release also reached the minimum values, and meanwhile, the composite achieved a UL94 V-0 classification in the vertical combustion experiment.

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