Shear-Induced Ordering in a Homopolymer Blend With Block-Copolymer Surfactant.
Shear-Induced Ordering in a Homopolymer Blend With
Nakatani, A. I.; Sung, L. P.; Hobbie, E. K.; Han, C. C.
Physical Review Letters, Vol. 79, No. 23, 4693-4696,
December 8, 1997.
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copolymers; surfactants; homopolymer blend
Small-angle neutron scattering has been used to
investigate the shear response of a low molecular weight
A/B homopolymer blend with A-B diblock-copolymer
surfactant. In the pure homopolymer limit,
long-wavelength critical fluctuations are sheared apart
and the flow stabilizes the disordered phase. Above a
threshold block-copolymer composition, however, these
fluctuations become enhanced by the shear, implying that
the flow has a destabilizing effect on the disordered