Relationship between some structural aspects and chosen mechanical properties of polymer blend fibres

The content of admixture in the mass of material is one of the most importa nt factors deciding the aggregation form of dispersed phase. In those cases when the content of admixture is high, about 10-90%, both component blends occur as homogeneous bundles of microfibrils. This kind of structure can b e quantitatively characterised based on Takayanagi's series-parallel models . Using these models the statistical relative content of the dispersed phas e in the cross-section and along the fibre axis can be determined. Takayana gi's models, as opposed to other classical rheological models, can be used for any uniaxial deformation, including breaking deformation. Moreover, thi s model can be used at the same time for characterisation of the super mole cular structure of the semi-crystalline component. The model parameters and stress characteristics of components allow Its to simulate the effect of t he quantitative content of blends on breaking stress and breaking elongatio n. The model parameters can be determined based on the measurement of sound speed in one-component fibres. Experimental data for polymethyl metacrylat e - polystyrene (PMMA-PS), polypropylene - polystyrene (PP-PS), and polyeth ylene - polystyrene (PE-PS) polymer blend fibres are presented.