Intumescent polybutylene succinate: Ethylenediamine phosphate and synergists

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 molybdate, aminated multiwall carbon nanotubes, at relatively low loading (10 wt.%). Among them, borate endows the best synergistic retardant effect with EDAP in PBS. Cone calorimetry shows that addition ratio 8:2 (wt: wt) dramatically reduces peak heat release rate (pHRR) by 57% as compared to neat PBS, indicating excellent efficiency combination used only 10wt.%. Beside, benefitting from incorporation PBS/EDAP/ZnB exhibits smoke suppression good mechanical properties. Solid state NMR (11B, 13C, 31P) gives information determine mechanism ZnB It was found it involves formation reinforced char highly thermally stable inorganic species, which acts protective physical barrier increasing cohesion limiting cracks.