Experimental analysis finds improved flame retardancy and fracture toughness in epoxy thermosets, suggesting potential for high-performance applications.
Enhancing the flame retardancy and toughness of epoxy thermosets without compromising glass transition temperature ( T g ) or mechanical strength is a critical challenge. In this study, the graft copolymer, SEBS‐g‐PEG was prepared by chemically grafting polyethylene glycol (PEG) to the terminal blocks of polystyrene‐block‐poly(ethylene‐ co ‐butylene)‐block‐polystyrene (SEBS). These block copolymers (BCPs) along with various loading levels of 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) were covalently incorporated into the epoxy thermosets to enhance their properties. The resulting composites exhibited excellent matrix compatibility, achieving up to a 200% improvement in fracture toughness and a 70% increase in flame retardancy at higher DOPO loadings (e.g., 8 wt%) without plasticizing effects. Notably, T g and tensile strength were preserved, enabling balanced high‐performance composites.
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Sajjad et al. (2025) studied this question.
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