Polymer Rheology
The science of polymer melt flow — viscosity, viscoelasticity, shear-thinning behavior, die swell, and melt fracture. Essential for understanding and troubleshooting all polymer processing operations.
“The fundamental physical laws of polymer science and processing technology empower modern industrial manufacturing.”
— PolymerHub Academic Advisory Board
🔥 5-Day Active Streak⏱️ ~3.5 hrs estimated to complete track
Non-Newtonian Rheology: Power-Law & Carreau-Yasuda Models for Polymer Melts
Core Curriculum Competencies
What You'll Master in this Track
Prerequisites & Readiness
Recommended Knowledge
- Undergraduate Science / Chemistry Foundation
- Engineering Mathematics Basics
9 Structured Lessons
Tier 1: Foundations & Molecular Principles (3 Lessons)
Non-Newtonian Rheology: Power-Law & Carreau-Yasuda Models for Polymer Melts
Polymer melt rheology, shear-thinning pseudoplasticity, Ostwald-de Waele Power-Law model, Carreau-Yasuda model, zero-shear viscosity, and power-law index n.
Time–Temperature Superposition, WLF Shifts & Rheological Master Curves
Time-Temperature Superposition (TTS), Williams-Landel-Ferry (WLF) shift factors, reduced frequency, and rheological master curves for G' and G''.
First Normal Stress Difference, Recoverable Strain & Polymer Melt Elasticity
Melt elasticity, First Normal Stress Difference N1, Weissenberg effect (rod climbing), extrudate die swell, and recoverable shear strain.
Tier 2: Intermediate Kinetics & Thermodynamics (3 Lessons)
Polymer Melt Rheology, Viscosity & Shear Flow Fundamentals
Newtonian vs non-Newtonian fluids, viscosity definition, and why understanding melt flow is essential for every processing engineer.
Shear-Thinning and the Power Law Model
How polymer viscosity decreases with shear rate, the power law (Ostwald-de Waele) model, flow behavior index n, and practical implications for injection moulding and extrusion.
Viscoelasticity — The Memory of Polymer Melts
Elastic recovery, die swell (Barus effect), Weissenberg effect, Maxwell and Kelvin-Voigt models, and why polymer melts behave like both liquids and solids.
Tier 3: Advanced Mechanisms & Spectrometry (3 Lessons)
Capillary Rheometry and Viscosity Measurement: Flow, Corrections & Shear Kinetics
How capillary rheometers measure viscosity at processing shear rates, Rabinowitsch correction, Bagley correction, and interpreting viscosity curves for material selection.
Melt Fracture, Sharkskin, and Flow Instabilities: Physics, Diagnostics & Mitigation
Flow instabilities in extrusion — sharkskin, gross melt fracture, slip-stick oscillation — their causes, critical shear stress values, and industrial solutions.
Rheology in Practice: Selecting and Processing Polymer Grades
Using rheological data for grade selection, how MFI relates to the viscosity curve, time-temperature superposition, WLF equation, and practical processing window determination.
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