Abstract :
[en] In this study, we evaluated the potential flame retardant effect of different metallic phytates as bio sourced phosphorous additives for poly(lactic acid) (PLA). Starting from sodium phytate, the sodium
cations were replaced by aluminum, iron or lanthanum cations as attested by elemental analysis. PLA metallic phytate composites containing 20 or 30 wt% of additives were produced by melt blending in
an internal mixer and their fire properties, thermogravimetric resistance have been characterized as well
as the PLA chain degradation occurring during melt processing. The most significant flame retardant
effect, observed by cone calorimeter test, was obtained when aluminum phytate was used. Cone calo rimeter testing combined with pyrolysis combustion flow calorimetry (PCFC) analysis indicated that the
barrier effect was more significant in the case of PLA filled with aluminum phytate. However, aluminum
phytate proved to be responsible for PLA chain degradation during melt processing. Combinations of
metallic phytate and native sodium phytate overcame this negative effect and allowed for limiting the
thermal degradation of PLA during melt processing while preserving good fire performances, i.e. sig nificant pHRR reduction and V-2 classification in UL-94 te
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