BODIPY coated on MXene nanosheets for improving mechanical and fire safety properties of ABS resin

Acrylonitrile-butadiene-styrene (ABS) resin is a commonly used engineering thermoplastic. Nevertheless, the fire toxicity hazards (HCN, NOx, NH3 and CO) generated from the combustion of ABS remains a major concern, especially in building fire scenarios. To address this issue, boron dipyrromethene (BODIPY) modified MXene (Ti3C2Tx) nanosheets were prepared and utilized as a flame retardant for ABS. The loading of 0.5 wt% BODIPY-MXene resulted in the uniform dispersion in ABS. Accordingly, the tensile strength, Young's modulus and elongation at break of ABS/BODIPY-MXene0.5 were improved by 27.8%, 18.6% and 17.9% respectively compared to neat ABS, suggesting the enhanced mechanical properties. The limiting oxygen index (LOI) value was increased from 19.5% for neat ABS to 21.5% and 23.5% for ABS/BODIPY-MXene0.5 and ABS/BODIPY-MXene2.0 benefitted from the rapid carbonization. The cone calorimeter coupled with FTIR analysis showed that the reductions in peak heat release rate (-24.5%), peak smoke production rate (-18.4%), peak concen-tration of HCN (-33.5%), NO (-22.0%), N2O (-46.6%), NH3 (-76.0%) and CO (-28.8%) were achieved by incorporating 0.5 wt% BODIPY-MXene to ABS in comparison with pure ABS. The improved fire safety properties were primarily attributed to the excellent barrier, free radical capture, and catalytic carbonization effect of BODIPY-MXene nanosheets within ABS matrix.