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Bending elastic properties of a block copolymer-rich lamellar phase doped by a surfactant: a neutron spin-echo study

By H. Egger, G. H. Findenegg, O. Holderer, R. Biehl, M. Monkenbusch and T. Hellweg

Abstract

Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.The influence of the short alkyl-chain ionic surfactant OTAB on the dynamic behavior of an inverse block copolymer-rich lamellar phase was investigated by neutron spin-echo spectroscopy (NSE). The observed intermediate scattering function can be described by a sum of two contributions. For high scattering vectors the model of Zilman–Granek plus a slow diffusional mode can be used to describe the experimental data and the bending elastic modulus κ for a polymer-rich membrane is calculated. At low scattering vectors the relaxation curves are strongly influenced by de Gennes narrowing arising from the structure factor of the Lα phase. Hence, the computed relaxation rates in this q-range are inversely proportional to the static structure factor. The present study demonstrates the necessity to directly investigate the dynamic behavior of lamellar phases and that an analysis of the width of the Bragg peaks can be insufficient to derive information about the single membrane elasticity, especially when both κ and [B with combining macron] depend on the composition of the membrane

Topics: 530 Physik
Year: 2014
DOI identifier: 10.1039/c4sm00494a
OAI identifier: oai:depositonce.tu-berlin.de:11303/5590
Provided by: DepositOnce
Journal:

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