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Micro- vs. macro-phase separation in binary blends of poly(styrene)-poly(isoprene) and poly(isoprene)-poly(ethylene oxide) diblock copolymers

By H. Frielinghaus, N. Hermsdorf, K. Almdal, K. Mortensen, L. Messe, L. Corvazier, J.P.A. Fairclough, A.J. Ryan, P.D. Olmsted and I.W. Hamley


In this paper we present an experimentally determined phase diagram of binary blends of the diblock copolymers poly(styrene)-poly(isoprene) and poly(isoprene)-poly(ethylene oxide). At high temperatures, the blends form an isotropic mixture. Upon lowering the temperature, the blend macro-phase separates before micro-phase separation occurs. The observed phase diagram is compared to theoretical predictions based on experimental parameters. In the low-temperature phase the crystallisation of the poly(ethylene oxide) block influences the spacing of the ordered phase. \ud \ud \u

Publisher: EDP Sciences
Year: 2001
OAI identifier: oai:eprints.whiterose.ac.uk:1952

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