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End-chain segment ordering in lamellar sublayers of a diblock copolymer |
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| Authors: | C Lorthioir P Auroy B Deloche |
| Institution: | (1) Laboratoire de Physique des Solides (CNRS-UMR 8502), Université Paris-Sud, 91405 Orsay, France, FR;(2) Physico-Chimie Curie (CNRS-UMR 168), Institut Curie, 11 rue Pierre et Marie Curie, 75005 Paris, France, FR |
| Abstract: | 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. Received: 27 March 2003 / Accepted: 9 May 2003 / Published online: 4 June 2003 RID="a" ID="a"e-mail: deloche@lps.u-psud.fr |
| Keywords: | PACS 68 08 -p Liquid-solid interfaces – 82 35 Jk Copolymers phase transitions structure – 76 60 -k Nuclear magnetic resonance and relaxation |
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