End-chain segment ordering in lamellar sublayers of a diblock copolymerC. Lorthioir1, P. Auroy2 and B. Deloche1
1 Laboratoire de Physique des Solides (CNRS-UMR 8502), Université Paris-Sud, 91405 Orsay, France
2 Physico-Chimie Curie (CNRS-UMR 168), Institut Curie, 11 rue Pierre et Marie Curie, 75005 Paris, France
(Received 27 March 2003 / Published online: 4 June 2003)
The segmental ordering within a lamellar polystyrene-polydimethylsiloxane diblock (PS-PDMS) was examined by NMR. A non-uniform stretching of the PDMS chains was evidenced. Although chain segments displaying isotropic reorientational motions are present along the chains, relaxation measurements on the free PDMS extremities demonstrate that these latter are oriented and submitted to a non-zero constraint. This specific result allows to precise some features of the order distribution within the lamellae.
68.08.-p - Liquid-solid interfaces.
82.35.Jk - Copolymers, phase transitions, structure.
76.60.-k - Nuclear magnetic resonance and relaxation.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2003