Polymeric Materials II
Objectives
At the end of this curricular unit the student will have acquired the knowledge, skills and competences that allow him: - Understand: (i) the specificities of elastomeric materials, namely rubber, (ii) the viscoelastic character of thermoplastic polymers and how this character influences their response to mechanical stresses, (iii) the relationship between structure and properties of the polymers, (iv) the need to make the polymers less harmful to the environment. - To be able to establish stress/strain relations for both elastomeric materials and thermoplastic polymers, when subjected to different types of mechanical actions.
- To know: (i) the main commercial polymers, including natural polymers, their properties and main applications, (ii) general information on the main thermoplastic polymer processing techniques.
General characterization
Code
12694
Credits
6.0
Responsible teacher
Maria Helena Figueiredo Godinho
Hours
Weekly - 4
Total - Available soon
Teaching language
Português
Prerequisites
Available soon
Bibliography
L.R.G. Treloar, “The physics of Rubber Elasticity”, Clarendon Press, Oxford, 1975
I.M.Ward, J.Sweeney, “An introduction to the Mechanical Properties of Solid Materials”, John Wiley and Sons Ltd, 2004.~
R. C. Arridge, "Mechanics of Polymers", Clarendon Press, Oxford, 1975
N.Phan-Thien, “Understanding Viscoelasticity”, Springer-Verlag, Berlin, 2002
R.J. Crawford, “Plastics Engineering”, Pergamon Press, 1987
“Physical Properties of Polymers Handbook”, Mark, James (Ed.), Springer, Washington, 2007
Scientific papers
“Reologia de Polímeros – Texto de Apoio”, M.T.Cidade, 2005.
Teaching method
Available soon
Evaluation method
The frequency of theoretical-practical classes is optional. The laboratory component and practical classes are compulsory to obtain attendance. The documents related to the teaching will be made available on the UC page at CLIP. Theoretical material will be complemented by exercises resolution classes, laboratory classes and case studies. The final classification (NF) is calculated from NF = 0.7 * (T1 + T2) /2+0.3*NP or NF = 0.7 * E + 0.3 * NP, where T1 and T2 represent the scores obtained in the 1st and 2nd tests , respectively, E the grade obtained in exam and NP the practical grade, obtained through a questionnaire. The student obtains approval in the discipline if: NP, frequency note, E and NF ≥ 9.5; T1 or T2 ≥ 8.
Subject matter
Sol-gel transition. Rubber vulcanization. Elasticity of the rubber.
Viscoelasticity: viscoelastic models, master curves, time-temperature overlap principle, WLF equation, Boltmann superposition principle.
Brief reference to the mechanical properties of polymer matrix composites.
Main commercial polymers. Additivations. Properties and applications.
General information on polymer processing
Polymers and environment. The evolution of polymer materials, natural polymers, opportunities and challenges.