ファイバーウォブリング法による超薄膜潤滑膜の粘弾性特性の測定 : 固定層の影響(S62-3 HDI(1),S62 情報機器コンピュータメカニクス)

概要

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Viscoelastic properties of PFPE lubricants confined in the gap less than several hundred nanometers were investigated by fiber wobbling method, which can measure small shear force (on the order of 1 nN) at high shear rate. In this study, we focused on the effect of end groups of lubricants on the gap dependence of viscoelastic properties. We investigated two kinds of PFPE lubricants, i.e. Z03 and Z-DOL. Both molecular weights and the chain structures are the same. However the former has no functional end groups but the latter does. Because of the functional end groups, Z-DOL forms the layering structure that consists of bonded and mobile layers. In contrast Z03 only consists of a mobile layer. As a result of viscoelastic measurement, the viscosity and the elasticity of both Z03 and Z-DOL take higher values than its bulk at a gap of less than 30 nm. This result indicates that anomalous increase in viscoelastic properties at a gap of about 30 nm is caused by mobile molecules, not by immobile ones.
2004-09-04