Advances in reticular materials for flame retardant polymers

Reticulation chemistry provides new ideas for the development of new composite materials. In recent years, many researchers have taken advantage of the large specific surface area, high porosity, easy chemical functionalization, and good nanostructure design of reticular materials to study the flame retardant effect and mechanism of reticular materials in various polymer materials, and mainly utilized the properties of metal-organic frameworks (MOFs), covalent organic frameworks (COFs), and hydrogen-bonded organic frameworks (HOFs) to apply them to a variety of polymers, and design polymer composites with enhanced flame retardant properties. The design of reticular composites is a new solution to improve the combustion performance of polymer composites, and thus a comprehensive and systematic study of them is highly desirable. To the best of our knowledge, there is no review on the research progress of reticular materials in the field of flame retardancy, so this paper provides a comprehensive overview of the research progress of MOFs, COFs and HOFs in flame retardant polymer materials in recent years. Mainly focusing on polymers such as epoxy resins and polyurethanes, we analyze the modification strategies and flame retardant effects of these three materials in the corresponding polymer materials. We compared the advantages and disadvantages of the three materials in terms of synthesis methods, structural design and application prospects. Finally, we will discuss in detail the challenges and limitations of using reticular materials in flame-retardant polymers based on an analysis of scalability, cost, and long-term stability.