Relaxation Behaviour of Polymers - NBCM058
Title: Relaxační chování polymerů
Guaranteed by: Department of Macromolecular Physics (32-KMF)
Faculty: Faculty of Mathematics and Physics
Actual: from 2008
Semester: summer
E-Credits: 3
Hours per week, examination: summer s.:2/0, Ex [HT]
Capacity: unlimited
Min. number of students: unlimited
4EU+: no
Virtual mobility / capacity: no
State of the course: taught
Language: Czech
Teaching methods: full-time
Guarantor: doc. RNDr. Helena Valentová, Ph.D.
Teacher(s): doc. RNDr. Helena Valentová, Ph.D.
Classification: Physics > Biophysics and Chemical Physics
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Annotation -
Phenomenological description and structural interpretation of relaxation behaviour of polymers. Methods of measurements of dynamic of polymer chains using dielectric and mechanical spectroscopy. Molecular description of mechanical and dielectric relaxation behavior of complex macromolecular systems.
Last update: T_KMF (18.05.2006)
Course completion requirements -

Successfully passed final oral exam.

Last update: Valentová Helena, doc. RNDr., Ph.D. (24.10.2019)
Literature -

L.H.Sperling: Introduction to Physical Polymer Science. Wiley, 1992

N.G.McCrum, B.E.Read, G.Williams: Anelastic and Dielectric Effects in Polymeric Solids. Wiley, N.Y.1967

C.W. Macosco: Rheology: Principles, Measurements, and Applications, Wiley, 1993

Last update: Valentová Helena, doc. RNDr., Ph.D. (14.02.2023)
Requirements to the exam -

Questions reflects the definition of syllabus.

Last update: Valentová Helena, doc. RNDr., Ph.D. (24.10.2019)
Syllabus -
Structure of polymers
Chemical composition, polymerization

Stereoisomerism, conformations, configurations.

Branching, crosslinking, copolymers, blends of polymers

Mechanical behavior
Phenomenology

Basic types of deformations, mechanical functions

Boltzmann's superposition principle

Viscoelastic models, mechanical spectra

Temperature dependence of viscoelastic behavior
Role of time (frequency)

Temperature-time superposition

Rate processes with constant activation energy, Williams - Landel - Ferry equation (WLF)

Molecular interpretation of WLF equation, free volume

Molecular theory of viscoelastic behavior
Thermodynamic of deformation

Statistic of chain, rubber elasticity

Dynamic of polymer chain, diffusion equation

Dielectric polarization
Polarization in static field

Polarization in time dependent field

Types of polarizations in electric field

Dielectric functions
Methods of measurements

Measurement of complex permittivity

Dependence of permittivity on time and frequency, distribution functions

Physical models of dielectric behavior
Harmonic oscillator

Diffusion transport

Relaxations with free charge

Last update: T_KMF (18.05.2006)