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Authors Frielinghaus, H. ; Hermsdorf, N. ; Sigel, R. ; Almdal, K. ; Mortensen, K. ; Hamley, I.W. ; Messé, L. ; Corvazier, L. ; Ryan, A.J. ; van Dusschoten, D. ; Wilhelm, M. ; Floudas, G. ; Fytas, G.
Title Blends of AB/BC Diblock Copolymers with a Large Interaction Parameter chi
Date 07.08.2001
Number 10064
Abstract Blends of poly(styrene)-b-poly(isoprene) (PS-PI) and poly( isoprene)-b-poly(ethylene oxide) (PI-PEO) were investigated by small-angle X-ray scattering, photon correlation spectroscopy, light microscopy, and rheology. Blends were prepared in which both diblocks had the same PI composition, f, and were investigated as a function of blend composition, Phi. We generally found a disordered one-phase region at high temperatures and two macrophase-separated, ordered phases at low temperatures. At low temperatures the only appreciable miscibility was found for f = 0.7 in the PI-PEO-rich phase. At intermediate temperatures we generally observed macrophase separation before microphase separation upon cooling. The macrophase separation boundary compared to the microphase boundary is lowered upon increasing f. For f = 0.6 and 0.7 we observe an adjustment of the d spacing of the macrophase-separated, ordered phases. The general trend of the phase behavior is described by a theory using the random phase approximation.
Publisher Macromolecules
Wikidata Q108123805
Citation Macromolecules 34 (2001) 4907-4916
DOI https://doi.org/10.1021/MA010233Q
Tags block-copolymers ordered structure phase-separation microphase separation forming copolymers fluid mixtures binary blends polymer blend disorder behavior

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