Octadecylbenzene is primarily used as an intermediate in the synthesis of surfactants and detergents. Its long alkyl chain makes it suitable for creating compounds that reduce surface tension, enhancing the cleaning efficiency of detergents in both household and industrial applications. Additionally, it is utilized in the production of lubricant additives, where it helps improve the stability and performance of oils under high temperatures and pressures. In the field of polymer chemistry, octadecylbenzene serves as a monomer or additive to modify the properties of plastics, such as increasing their flexibility or resistance to environmental factors. It is also employed in research and development for studying hydrophobic interactions and self-assembly processes in various chemical systems.