The structure and melt-state viscoelastic properties for liquidlike ordered micelles, prepared by blending a highly asymmetric polystyrene-rich block copolymer with a polystyrene homopolymer, are examined using a combination of small-angle neutron scattering (SANS), electron microscopy, and dynamic oscillatory rheological measurements. The SANS data, analyzed using a monodisperse Percus−Yevick hard-sphere model, indicated that with homopolymer addition the core diameter remained unchanged while the corona was swollen. The melt viscoelastic data indicated a surprising blend composition-independent “Newtonian” viscosity for blend compositions ranging from 5 to 50 wt % block copolymer. A simple model for the viscosities accounting for the corona swelling, indicated by SANS, provided reasonable agreement with the experimental data.
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Yurekli et al. (2002) studied this question.
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