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Synthesis of Fullerene-Styrene-Methacrylic Acid Copolymer Nanoball and Its Lubrication Behavior

A fullerene-styrene-methacrylic acid copolymer was synthesized via radical polymerization and characlerized by FTIR, UV-Vis and GPC. The copolymer is soluble in polar solvents such as water, methanol, acetone, tetrahydrofuran. TEM observation revealed its ideal spherical shape in water with an average diameter of about 40 nm. Four-ball machine tests indicated that addition of an amount of 0.5%(mass fraction) the fullerene copolymer to base stock can effectively increase the bearing capacity(P B value) and the antiwearing ability of the base stock(2%(mass fraction) of triethanolamine and 0.5%(mass fraction) of OPZ aqueous solution). The morphology study of the worn surfaces by SEM showed that addition of the copolymer leads to reduction of wear scar size and decrease of wear depth. With the increasing of the content of the fullerene copolymer, the friction coefficient reduces rapidly from 0.233 for base stock to minimum value of 0.061 5. With the increasing of the added fullerene cop/lymer, bearing capacity increases rapidly from 135 N for base stock to maximum value of 490 N.