Friction dependence on alpha-relaxations in a tethered polymer monolayer.
Functionalized low-molecular-weight polyisoputylene is commonly used as a lubricant additive to control low-velocity friction in clutches. The friction of tethered monolayers as a function of temperature and velocity was examined using lateral force microscopy. The friction force was found to obey time-temperature superposition, which indicates that the friction originates from a single relaxation mode. The scaling factors are identical to those obtained from neutron spin echo experiments of alpha-relaxations, linking the friction directly to segmental motion.
Jia
Junhong
J
Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA.
Bender
Jonathan W
JW