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Intumescent polybutylene succinate: Ethylenediamine phosphate and synergists

Abstract : In this work, a series of intumescent flame retarded polybutylene succinate (PBS) formulations have been developed based on ethylenediamine phosphate (EDAP) and different co-additives, i.e ., zinc borate, melamine borate, zinc molybdate, and aminated multiwall carbon nanotubes, at relatively low loading (10 wt.%). Among them, zinc borate endows the best synergistic flame retardant effect with EDAP in PBS. Cone calorimetry shows that addition of EDAP and zinc borate with a ratio of 8:2 ( wt: wt ) dramatically reduces the peak heat release rate (pHRR) by 57% as compared to neat PBS, indicating the excellent flame retardant efficiency of this combination used at only 10wt.%. Beside, benefitting from the incorporation of zinc borate, PBS/EDAP/ZnB exhibits excellent smoke suppression and good mechanical properties. Solid state NMR ( 11 B, 13 C, and 31 P) gives information to determine the flame retardant mechanism of EDAP and ZnB in PBS. It was found that it involves the formation of a reinforced intumescent char with highly thermally stable inorganic species, which acts as a protective physical barrier increasing the char cohesion and limiting the formation of cracks.
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Soumis le : lundi 27 septembre 2021 - 17:05:15
Dernière modification le : mardi 28 septembre 2021 - 03:24:12

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Fei Xiao, Gaelle Fontaine, Serge Bourbigot. Intumescent polybutylene succinate: Ethylenediamine phosphate and synergists. Polymer Degradation and Stability, Elsevier, 2021, 192, pp.109707. ⟨10.1016/j.polymdegradstab.2021.109707⟩. ⟨hal-03356133⟩

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