Blends of AB/BC diblock copolymers with a large interaction parameter Chi

Frielinghaus, H.; Floudas, G.; Corvazier, M. F.; Sigel, R.; Fytas, G.; Mortensen, K.; Wilhelm, M.; Messé, L.; Ryan, A. J.; Hermsdorf, N.; Hamley, I. W.; Almdal, K.; van Dusschoten, D.

doi:10.1021/ma010233q

Journal Article

Blends of AB/BC diblock copolymers with a large interaction parameter Chi

Frielinghaus, H.FZJ* ; Hermsdorf, N. ; Sigel, R. ; Almdal, K. ; Mortensen, K. ; Hamley, I. W. ; Messé, L. ; Corvazier, M. F. ; Ryan, A. J. ; van Dusschoten, D.FZJ* ; Wilhelm, M. ; Floudas, G. ; Fytas, G.

2001
Soc. Washington, DC

Macromolecules 34, 4907 - 4916 (2001) [10.1021/ma010233q]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1296 doi:10.1021/ma010233q

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.

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