Abstract
The features of fibre formation in blends of incompatible polymers, during melt-extrusion through capillaries, have been studied, using linear PE and PS blends, as a function of component viscosities, blend preparation conditions and shear stress. It was shown that fibre formation was achieved between defined limits of shear stress, depending on the ratios of viscosities of the fibre forming polymer and the polymer acting as the dispersing medium. Continuous fibres were obtained with a diameter of a few micrometers over a wide shear stress range with viscosity ratios of unity or less, in blends containing the dispersed phase. Fibre formation did not occur at higher viscosity ratios (tens of units) of the components.
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