Enhanced Flame-Retardant Polyurethane Composite by Integrating Isocyanate-Grafted Graphene Oxide for Improved Mechanical and Thermal Properties
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Polyurethane (PU), used in various industrial areas, is vulnerable to fire and emits toxic gases when combusted, so it needs to be flame-retardant. Numerous studies have been conducted to impart flame retardancy, among which reactive phosphorus-containing polyol (P-polyol) has garnered significant attention. However, increasing the content of P-polyol over the critical threshold to enhance flame retardancy results in decreased performance, including mechanical properties, heat resistance, and smoke point. To overcome these challenges, isocyanate-grafted graphene oxide (iGO) is integrated into the bonding network of flame-retardant PU (FRPU). This study aims to utilize the exceptional mechanical properties, heat resistance, and high thermal conductivity of graphene to enhance the mechanical and thermal properties of FRPU while maintaining superior flame retardancy. It is expected that this study will facilitate the expansion of its applications and enable the reduction of fire damage.