Volume 62, Number 5, June 2003
|Page(s)||746 - 752|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 May 2003|
Heterogeneity of the chain segment dynamics and ordering in lamellar layers of a symmetric triblock copolymer
Laboratoire de Physique des Solides (CNRS-UMR 8502), Université Paris-Sud 91405 Orsay, France
2 Institut Curie (CNRS-UMR 168) - rue Pierre et Marie Curie, 75005 Paris, France
3 Institut Charles Sadron (CNRS-UPR 22) - rue Boussingault, 67083 Strasbourg, France
Accepted: 31 March 2003
The segmental ordering within the sublayers of a lamellar polystyrene-poly dimethylsiloxane-polystyrene triblock (PS-PDMS-PS) is examined by NMR. The carbon and deuterium NMR line shapes of the PDMS sequence (soft block) reveal clearly a wide distribution of segmental orientational order S in the lamellae and thus a distribution of constraints probed by the chains. It is observed that this distribution is mainly due to the coexistence of positive and negative S, resulting from a competitive ordering effect induced by the presence of glassy interfaces ( in their vicinity) and the chain-end anchoring junctions ().
PACS: 82.35.Jk – Copolymers, phase transitions, structure / 68.08.-p – Liquid-solid interfaces / 76.60.-k – Nuclear magnetic resonance and relaxation
© EDP Sciences, 2003
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