Volume 53, Number 5, March 2001
|Page(s)||680 - 686|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
Micro- vs. macro-phase separation in binary blends of poly(styrene)-poly(isoprene) and poly(isoprene)-poly(ethylene oxide) diblock copolymers
Department of Condensed Matter Physics and Chemistry
RisøNational Laboratory - DK-4000 Roskilde, Denmark
2 Department of Chemistry, University of Sheffield - Sheffield S3 7HF, UK
3 Department of Physics and Astronomy and Polymer IRC University of Leeds - Leeds LS2 9JT, UK
4 School of Chemistry, University of Leeds - Leeds LS2 9JT, UK
Accepted: 15 December 2000
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.
PACS: 81.30.-t – Phase diagrams and microstructures developed by solidification and solid-solid phase transformations / 61.10.Eq – X-ray scattering (including small-angle scattering) / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 2001
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