Applications and Research Progress of Living/Controlled Free Radical Polymerization in Tribology
Living/controlled free radical polymerization(CRP)stands out as a versatile and highly controllable polymerization technique,facilitating the precise tuning of molecular weights,structures,and properties of polymers throughout the polymerization process.This methodology finds extensive application across diverse domains such as materials science and chemical engineering.This review delves into the tribological implications of polymers primarily synthesized via CRP.It provides a comprehensive examination of tribology studies related to controlled polymerization surface modifications and the synthesis of polymer lubrication additives.It also discusses their subsequent effects on lubricant viscosity and performance enhancements.Firstly,the paper describes the synthesis method of polymer brushes and their roles and advantages in surface modification across various dimensions.It summarizes their unique lubrication mechanism and introduces the current research status on stimulus-responsive polymer brushes,including responses to salt,pH,and light.Secondly,we analyzed the modification of lubricant viscosity and the enhancement of friction reduction and anti-wear properties of polymeric lubricant additives with a three-dimensional structure,such as micelles and branched polymers synthesized by CRP technology.The advantages of using them as lubrication additives and their lubrication mechanisms are summarized.
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