4.7 Article

Intumescent polybutylene succinate: Ethylenediamine phosphate and synergists

Journal

POLYMER DEGRADATION AND STABILITY
Volume 192, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2021.109707

Keywords

Polybutylene succinate; Flame retardant; Ethylenediamine phosphate; Synergism

Funding

  1. China Scholarship Council [201804910605]

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In this study, intumescent flame retarded polybutylene succinate (PBS) formulations were developed using ethylenediamine phosphate (EDAP) and different co-additives. Among them, zinc borate showed the best synergistic flame retardant effect with EDAP in PBS. Analysis using solid state NMR and cone calorimetry revealed the formation of a highly thermally stable inorganic char by EDAP and zinc borate in PBS, acting as an effective flame retardant mechanism.
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 (B-11, C-13, and P-31) 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. (C) 2021 Elsevier Ltd. All rights reserved.

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