Advances in Reticular Materials for Flame Retardant Polymers

The emergence of reticular materials has introduced innovative approaches in the development of new composite materials,particularly in enhancing fire-retardant properties. Recent studies have focused on the flame retardancy effects and mechanisms of reticular materials in various polymer matrices. Leveraging the characteristics of these materials—including their high specific surface area,large porosity,ease of chemical functionalization,and excellent design flexibility in nanostructures,researchers have adjusted the properties of metal-organic frameworks (MOFs),covalent organic frameworks (COFs),and hydrogen-bonded organic frameworks (HOFs)for incorporation into diverse polymers,resulting in the design of composites with improved flame retardancy. The design of reticular composites represents a promising solution for enhancing the combustion performance of polymeric materials. Despite its importance,a comprehensive review on the progress of reticular materials in the field of flame retardancy is still lacking. Therefore,this paper provides a thorough review of the latest advancements in MOFs,COFs,and HOFs concerning flame-retardant polymer materials. It specifically examines modification strategies and flame-retardant effects for epoxy resins, polyurethanes,and other polymers. Finally,we offer a brief commentary on future research opportunities and challenges related to polymer composite flame retardants based on reticular materials.