Effective Flame-Retardant Coatings for Expanded Polystyrene Foam: A Study Based on Deep Eutectic Solvent and Graphene...

In this study, graphene oxide (GO) was synthesized using an improved Hummers method. Deep eutectic solvents (DESs) were prepared using a simple mixing method. The synthesis of DES-GO composites is employed to increase the thermal stability of flame retardants. Expanded polystyrene (EPS) foam is widely recognized due to its advantageous properties, including low weight, thermal insulation, and impact resistance. However, its inherent flammability poses significant safety risks. This study investigates the development of innovative green flame-retardant coatings for EPS by incorporating DES and DES-GO composite. These eco-friendly coatings are engineered to improve flame resistance while ensuring optimal mechanical integrity, thermal stability, adhesion, and water resistance. The findings demonstrate that DES and GO provide exceptional flame-retardant performance by forming thermally stable carbonaceous layers, effectively suppressing heat and smoke generation during combustion. Additionally, density functional theory analyses reveal insights into the formation mechanisms of DES and DES-GO composite materials. Annealing molecular dynamics simulation reveals the adhesion behavior and stability at elevated temperatures for the number of cycles. Vertical flammability tests and limiting oxygen index measurements confirm significant improvements in the flame resistance for EPS foam. This study paves the way for safer, greener, and more effective flame-retardant solutions for EPS, promoting advancements in fire safety technology with enhanced environmental sustainability.