TY - JOUR
T1 - Antiwear performance of polysiloxane-containing copolymers at oil/metal interface under extreme pressure
AU - Ni, Sheng Chung
AU - Kuo, Ping Lin
AU - Lin, Jen Fin
N1 - Funding Information:
The authors would like to thank Professor Jen-Fin Lin of the Department of Mechanical Engineering, National Cheng Kung University, for the technical assistance in determining AW properties, and the National Science Council for their general financial support of this research.
PY - 2002/10
Y1 - 2002/10
N2 - Copolymers separately containing polysiloxane, thiophosphate-polysiloxane, thiophosphate-amino, and polysiloxane-amino groups were synthesized by free radical copolymerization. The antiwear behaviors of the synthesized copolymers as an oil additive in base oil were assessed with a wear tester by measuring the oil temperature, frictional coefficient, and electrical contact resistance between the two metal surfaces. Thiophosphate-containing copolymers were noted to limit the increase in the oil temperature and reduce the frictional coefficient by adsorbing the thiophosphate group onto the metal surfaces and then reacting on those surfaces. The oil temperature and the frictional coefficient of thiophosphate-polysiloxane-containing copolymer were lower than that of other synthesized copolymers before chemical adsorption by the thiophosphate group, which was resulted from the protection by the polysiloxane structure. The amino-polysiloxane-containing copolymer that settled on the metal surfaces by adsorbing the amino group reduced the frictional coefficient and limited the increase in the oil temperature caused by the presence of the polysiloxane group. Nevertheless, the amino-polysiloxane-containing copolymer physically adsorbed onto the metal surfaces at a low temperature and desorbed from the metal surfaces with increasing oil temperature.
AB - Copolymers separately containing polysiloxane, thiophosphate-polysiloxane, thiophosphate-amino, and polysiloxane-amino groups were synthesized by free radical copolymerization. The antiwear behaviors of the synthesized copolymers as an oil additive in base oil were assessed with a wear tester by measuring the oil temperature, frictional coefficient, and electrical contact resistance between the two metal surfaces. Thiophosphate-containing copolymers were noted to limit the increase in the oil temperature and reduce the frictional coefficient by adsorbing the thiophosphate group onto the metal surfaces and then reacting on those surfaces. The oil temperature and the frictional coefficient of thiophosphate-polysiloxane-containing copolymer were lower than that of other synthesized copolymers before chemical adsorption by the thiophosphate group, which was resulted from the protection by the polysiloxane structure. The amino-polysiloxane-containing copolymer that settled on the metal surfaces by adsorbing the amino group reduced the frictional coefficient and limited the increase in the oil temperature caused by the presence of the polysiloxane group. Nevertheless, the amino-polysiloxane-containing copolymer physically adsorbed onto the metal surfaces at a low temperature and desorbed from the metal surfaces with increasing oil temperature.
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U2 - 10.1016/S0043-1648(02)00224-7
DO - 10.1016/S0043-1648(02)00224-7
M3 - Article
AN - SCOPUS:0036795056
SN - 0043-1648
VL - 253
SP - 862
EP - 868
JO - Wear
JF - Wear
IS - 7-8
ER -