We propose to carry out the fundamental research of - the conditions under which rheologically determined polymer processes fail due to instabilities causing shape an structural defects; - the suitable criteria determining the stability regions of these processes. Research goals: - to determine experimentaly the regions of characteristics variables expressing behaviour of viscoelastic liquids in capillaries and extrusion dies; - experimental analysis of stress state in viscoelastic liquids and analysis of factors leading to relaxation anomalies and flow defects at the exit from capillaries and extrusion dies; - classification of viscoelastic liquids according to the outflow characteristics considering geometric, kinematic and time aspects of the flow. |
