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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
Author(s) -
Hamley Ian W.,
O'Driscoll Ben M. D.,
Lotze Gudrun,
Moulton Claire,
Allgaier Jürgen,
Frielinghaus Henrich
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900474
Subject(s) - copolymer , ethylene oxide , lamellar structure , materials science , phase diagram , oxide , polymer chemistry , small angle x ray scattering , phase (matter) , gyroid , chemical engineering , lamellar phase , scattering , polymer , chemistry , organic chemistry , optics , composite material , physics , engineering , metallurgy
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.