Viscosity is a crucial parameter for lubricant classification and selection.Proper viscosity is the guarantee of sufficient lubrication.Among various oil additives,pour point depressants and viscosity index improvers are considered to be the key to adjust oil viscosity and to ensure excellent low-temperature fluidity and excellent viscosity-temperature performance.Polymethacrylates(PMA)play an essential role in the fields of pour point depressants and viscosity index improvers because of their flexible structural flexibility and strong adaptability to synthetic processes.The mechanisms of PMA additives in improving low-temperature fluidity and viscosity-temperature performance were elucidated,the effect of PAM molecular structure and topological structure on the properties of PMA products was discussed,and the future development direction of PMA additives was prospected,which had an important guiding role in the development of universal and efficient PMA additives.
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