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

H. Frielinghaus; N. Hermsdorf; K. Almdal; K. Mortensen; L. Messé; L. Corvazier; J. P. A. Fairclough; A. J. Ryan; P. D. Olmsted; I. W. Hamley

doi:10.1209/epl/i2001-00205-7

All issues

Volume 53 / No 5 (March 2001)

Europhys. Lett., 53 5 (2001) 680-686

Abstract

Issue		Europhys. Lett. Volume 53, Number 5, March 2001


Page(s)		680 - 686
Section		Interdisciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i2001-00205-7
Published online		01 December 2003

Europhys. Lett., 53 (5), pp. 680-686 (2001)

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

H. Frielinghaus¹, N. Hermsdorf¹, K. Almdal¹, K. Mortensen¹, L. Messé², L. Corvazier², J. P. A. Fairclough², A. J. Ryan², P. D. Olmsted³ and I. W. Hamley⁴

¹ 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

Received: 7 April 2000
Accepted: 15 December 2000

Abstract

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

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