Identification of finite shear-elasticity at low thickness in the liquid state of molecular (OTP) and polymeric glass formers (PBuA)

Laurence Noirez (1) , Patrick Baroni (1) , Hakima Mendil-Jakani (2)

1 LLB - UMR 12 - Laboratoire Léon Brillouin
2 SPRAM - UMR 5819 - Structures et propriétés d'architectures moléculaire

Finite shear elasticity has been identified at low gap in the liquid state of various viscous fluids. The present study is expanded to a van der Waals glass former, the o-Terphenyl and to an ordinary polymer melt, the polybutylacrylate. Elasticity is also identified in these materials at the sub-millimeter scale and far above any phase transition. This macroscopic property is discussed in the frame of the terminal relaxation modes (-process or reptation times) and of their molecular interpretation.

Mots clés: Physical Sciences

Domaines: Matière Condensée [cond-mat]

Laurence Noirez, Patrick Baroni, Hakima Mendil-Jakani. Identification of finite shear-elasticity at low thickness in the liquid state of molecular (OTP) and polymeric glass formers (PBuA). Philosophical Magazine, 2011, pp.1. ⟨10.1080/14786435.2010.536176⟩. ⟨hal-00670239⟩