The morphology and the corressponding rhelogical properical properties of phase separating binary mixtures under shear flow are studied by computer simulation based on the modified time-dependent Ginzburg-Lanbau (TDGL) model In order to investigate the hydrodynamic effect, model Hin three dimensions has been used to simulate the phase separation of binary fluids under shear flow. For the sake of comparison, the simulation has also been performed based on simple binary solid model (model B). It is found that, for deep and critical quench, the domain grows faster and the domain anisotropy is lower in binary fluids due to the internal flow field induced by hydrodynamic interaction. For deep and off-critical quench, the internal flow field makes the elongated domian interaction. For deep and off-critical quench, the internal flow field makes the elongated domian quickly relax to their original spherical shape before they are mutually contacted each other. Thus, it reduces the domian merging probalility. It is also found that, for deep and critical quench, there are two peaks appeared in the shear viscosity as a function of shear strain at low shear rate, which agrees with the experimentally observations by hydrodynamic interaction and thus the idfference between binary solids and binary fluids is small. All these observed unique characters have been explained according to the hydrodynamic interaction and the relaxation rate of the deformed interface.

Theory and application are described of a new protor-synchronized 3D-NMR (three-dimensional nuclear magnetic resonance) experiment, that correlates molecular structure, order, and dynamics in partially oriented solids. General expressions for the sideband intensities in three frequency dimeasions are developed for uniaxially ordered samples undergoing ultraslow molecular motions. For an isotrpic owder the exchange pattern is confined to a single plane perpendicular to one of the frequency axes. For a partially ordered solid without exchange the sideband pattern s confined to a cross-diagonal plane. Sidebands in the full 3D cube result only if the residue giving rise to the signal is involved in both, molecular order and dynamics.The experiment, therefore, correlates these two properties and relates them to the chemical structure. Moreover, it offers a means to exploit the superior information about the geometry of the molecular motions provided by partially ordered samples under high resolution magic angle spinning (MAS) conditions. The technique is illustrated by 3D MAS spectra of highly oriented poly (oxymethylene), where strong positive and negative sidebandsin the full 3D cube result from the helical jump motion.