IN-SITU FORMATION OF MICROFIBRILLAR MORPHOLOGY IN POLYMER BLENDS

摘要

The work focuses on microfibrillar-phase formation in polymer blends during extrusion through a die with semihyperbolic-converging channel. For these purposes, three polyethylene/polypropylene blends with the mixing ratios (wt./wt.) 80/20, 70/30 and 60/40 were prepared. Final structure and properties of extruded blends were examined using electron microscopy, wide-angle X-ray scattering, differential scanning calorimetry and tensile testing. It is demonstrated that the formation of microfibrillar-phase morphology is achieved in all blends, independent of their mixing ratios. However, the structure and properties of these microfibrillar-phase composites are strongly influenced by mixing parameters.