End-chain segment ordering in lamellar sublayers of a diblock copolymer
The European Physical Journal E(2003)
摘要
: 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.
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关键词
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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