Rheology of Materials
Code
7436
Academic unit
Faculdade de Ciências e Tecnologia
Department
Departamento de Ciências dos Materiais
Credits
6.0
Teacher in charge
Maria Helena Figueiredo Godinho
Weekly hours
5
Teaching language
Português
Objectives
At the end of this course the student should have acquired knowledge, skills and competence to: recognize the importance of viscoelasticity and how it affects the deformation of the fluid when subjected to shear and extensional stresses; know which parameters affect the rheological functions of the fluids, in particular polymers; understand the rheological behavior of materials and products such as multiphase systems (suspensions, emulsions, polymer blends), cosmetics, food, paints, etc.; measuring rheological properties of different types of fluids, in particular polymers, using appropriate equipment; calculating rheological functions measured with different geometries; apply the knowledge of the rheological behavior to polymer processing conditions and adjust the results of experimental data to equations / models appropriate and from there to extract relevant information
Subject matter
The concept of rheology and the importance of its study. Fundamentals of rheology. Viscoelasticity, viscoelastic solids and liquids, Deborah number, Reynolds number. Laminar and turbulent flows. Classification of fluids: Newtonian and non-newtonian fluids
Rheological functions of non-newtonian fluids: viscosity, normal stress differences, complex viscosity, dynamic, elastic and dissipative modulus. Extensional viscosity, relationships between shear and extensional rheological functions.
Rheology of polymers and polymer solutions: factors affecting the rheological properties of polymers: shear rate, temperature, pressure, weight average molecular weight and molecular weight distribution, concentration, molecular structure, additives.
Rheology of liquid crystalline polymers; multiphase polymer systems: suspensions, emulsions, polymer blends, block copolymers, food products, pharmaceuticals and cosmetics, paints, construction materials.
Bibliography
H.A. Barnes, J.F. Hutton and K. Walters, “An Introduction to Rheology”, Elsevier Publishers, 1989.
R.B. Bird, R.C. Armstrong and O. Hassager, “Dynamics of Polymeric Liquids: Volume II, Fluid Mechanics”, John Wiley & Sons Inc., 1977.
L.E. Nielsen, “Polymer Rheology”, Marcel Dekker, Inc., 1977.
“Reologia e suas Aplicações Industriais”, A. Gomes de Castro, J.A. Covas e A. Correia Diogo (Eds), Ciência e Técnica (Instituto Piaget), 2001.
“NL Rheology Handbook”, NL Industries, Inc..
“Paints, Coatings and Solvents”, D. Stoye andW. Freitag(Eds), Wiley – VCH, 2001.
“Introduction to Paint Chemistry and principles of paint technology”, J. Bentley and G.P. Turner, Chapman & Hall, 2000.
“Reologia de Polímeros – Texto de Apoio”, M.T.Cidade, 2005.