The European Physical Journal E

, Volume 19, Issue 1, pp 77–85

Solid-like rheological response of non-entangled polymers in the molten state

Focus Point

DOI: 10.1140/epje/e2006-00011-x

Cite this article as:
Mendil, H., Baroni, P. & Noirez, L. Eur. Phys. J. E (2006) 19: 77. doi:10.1140/epje/e2006-00011-x

Abstract.

We show that non-entangled polymers display an elastic-like behaviour at a macroscopic scale (probed at some 0.100 mm thickness) up to at least hundred degrees above the glass transition temperature. This observation, found under non-slippage conditions, both for side-chain liquid crystalline polymers and ordinary polymers, is in contradiction with the typically found flow behaviour of polymer melt. Our measurements were carried out with a conventional rheometer at thicknesses of several tenths millimetres. Thus, we were probing bulk properties. The observed elasticity supposedly implies that even in the melt the chains experience a cohesive effect of macroscopic distances, involving collective motions over time scales longer than the individual relaxation time of an individual polymer chain. The detection of such a solid-like property of molten non-entangled polymers is of considerable importance for a better understanding of the polymer dynamics.

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Authors and Affiliations

  1. 1.Laboratoire Léon Brillouin (CEA-CNRS)Gif-sur-YvetteFrance