
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 Teresa Varanda Cidade
Weekly hours
5
Total hours
75
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
Prerequisites
There are no mandatory prior courses, however it is advisable that students have knowledge of polymers (acquired in course units of Polymer Chemistry and Physics of Polymers) and mathematics (eg solving differential equations) and fluid mechanics.
Subject matter
The concept of rheology and the importance of its study. Fundaments of rheology. Viscoelasticity, viscoelastic solids and liquids, Deborah number. 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, fiber reinforced polymers, 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.
Teaching method
With regard to the theoretical contents, exposure of matter will be taken resourting to data show. The slides will be made available to students on the course page. This page will contain all elements relating to the discipline: objectives, program content, scheduling of different types of classes, methods of assessment, problems, scripts of practical work, methods and assessment results, recommended bibliography and summaries.
Concerning problems, students will be asked to solve them previously, the classes serving for correction and clarification of doubts. At the end of the classes of problems, all students, whether they have done, or not, prior resolution of the proposed exercises, will be aware of the resolution, which will be made in the chalkboard, whenever possible by the students themselves.
For practical content, 5 laboratory classes will be given which not only will help students to consolidate the theoretical background but will also familiarize the students with equipments usually used for rheological characterization.
Evaluation method
2 Tests and 5 questionnaires, corresponding to 5 laboratory work, throughout the semester will be held.
Students who obtain, as a note of continuous assessment, a minimum of 9.5 val will be exempted from examination: those having frequency do not obtain the minimum for exemption from the examination (minimum 9 val in tests and 8 val in questionnaires), will access the exam, and this has a weight for the final grade of 60%, the remaining 40% corresponding to the note of frequency. The frequency is obtained by averaging the 5 questionnaires, with a minimum of 9.5.
The frequency will be assigned for a period of 2 years.