Expansion: Polymeric materials are a class of macromolecular compounds formed by the polymerization of several monomers through chemical reactions. They are lightweight, high-strength, corrosion-resistant, etc., and therefore have a wide range of applications in various fields. There are many types of polymer materials, including polyethylene, polypropylene, and polyvinyl chloride. Each polymer material has different characteristics and uses, and plays an important role in industrial production and daily life. lex15, as a polymer material, its light weight and versatility make it widely used in many fields, and continues to promote the development of materials science.