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Highly asymmetric phase diagram of a poly(1,2-octylene oxide)-poly(ethylene oxide) diblock copolymer system comprising a brush-like poly(1,2-octylene oxide) block

By Ian Hamley, Ben O'Driscoll, Gudrun Lotze, Claire Moulton, Jurgen Allgaier and Henrich Frielinghaus

Abstract

The phase diagram of a series of poly(1,2-octylene oxide)-poly(ethylene oxide) (POO-PEO) diblock copolymers is determined by small-angle X-ray scattering. The Flory-Huggins interaction parameter was measured by small-angle neutron scattering. The phase diagram is highly asymmetric due to large conformational asymmetry that results from the hexyl side chains in the POO block. Non-lamellar phases (hexagonal and gyroid) are observed near f(PEO) = 0.5, and the lamellar phase is observed for f(PEO) >= 0.5

Publisher: Wiley
Year: 2009
DOI identifier: 10.1002/(ISSN)1521-3927
OAI identifier: oai:centaur.reading.ac.uk:16616
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