Exponential and non-exponential relaxation and early state of spinodal decomposition in polymer blends by SANS
With neutron small-angle scattering it was found, for two different polymer blends, that the time-dependent structure factor S(Q, t) relaxes exponentially or also non-exponentially after a temperature step has been applied. The classical Cahn-Hilliard-Cook theory predicts an exponential time behaviour of S(Q, t). The observed deviations may be due to the correlation of the order parameter with internal motions of the polymer segments or with other internal variables of a viscoelastic material near its glass transition.
Key wordsPolymer blends spinodal decomposition relaxation segmental motion viscoelastic material
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