Basics of Rheology: A reológia alapjai

Időpont

Témák

8:30-9:00

Résztvevők regisztrációja

9:00-9:20

Megnyitó
Bemutatkozik az Anton Paar Hungary Kft.

9:20-11:00

Rheology, theory: viscosity and flow behavior
- Introduction: rheology, viscoelastic behavior. Simple viscosity test methods: flow cups, capillary and falling ball viscometers, rotational tests using relative and absolute measuring geometries, concentric cylinders, cone-and-plate, parallel plates
- Definition of terms: shear stress, shear rate, (shear) viscosity, viscosity law of Newton
- Rotational tests: controlled shear rate (CSR), controlled shear stress (CSS), application diagrams with examples of industrial users
- Ideally viscous (Newtonian) flow behavior
- Shear-thinning (pseudoplastic) flow behavior, zero-shear viscosity of polymers
- Shear tickening

11:00-11:15

Kávészünet

11:15-12:30

Types of flow behavior
- Time depending
- Temperature depending

12:30-13:30

Ebédszünet

13:30-15:00

Rheology, theory: elasticity and viscoelastic behavior
- Introduction: viscoelastic behavior
- Definition of terms: (shear) strain or deformation, shear modulus, elasticity law (according to Hooke), strain rate (shear rate)
- Ideally elastic deformation behavior
- Oscillatory tests: introduction, definition of the terms: storage modulus and loss factor modulus, loss or damping factor, vector diagram, application diagrams with examples of industrial users
- Amplitude sweep: linear viscoelastic (LVE) range, yield point and flow point

15:00-15:15

Kávészünet

15:15-16:30

Continued: Rheology, theory: elasticity and viscoelastic behavior
- Frequency sweep: uncrosslinked polymers, curve crossover point, complex viscosity, zero-shear viscosity, Maxwell behavior; crosslinked polymers; dispersions and gels: long-term storage stability
- Time-depending viscoelastic behavior: structural break and recovery, thixotropic behavior; gel formation, curing
- Temperature-depending viscoelastic behavior (DMTA): heating, melting, glass transition; cooling, crystallization; sol/gel transition; gel formation, curing