Abstract

The conformation of polymer chains in the melt during simple shear flow has been characterized by SANS on a narrow molecular weight distribution polystyrene sample. An apparatus has been designed which allows one to freeze-in by quenching uniform shear orientations in thick specimens on which the scattering experiments can be performed in the three principal shear directions. In the 1-2 shearing plane, the orientation of molecular anisotropy with respect to the shear axes is found to depend on the magnitude of the scattering vector and therefore on the considered length scale on the chin. A method has been proposed to analyze the data in this plane. The chin dimension in the neutral shear direction remains unaffected by the flow

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