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Friction dependence on alpha-relaxations in a tethered polymer monolayer.

Research paper by Junhong J Jia, Jonathan W JW Bender

Indexed on: 24 Apr '07Published on: 24 Apr '07Published in: Nano Letters



Abstract

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.