Unit POLYMER TECHNOLOGY
- Course
- Sustainable materials and processes engineering
- Study-unit Code
- A002468
- Curriculum
- In all curricula
- Teacher
- Luigi Torre
- Teachers
-
- Luigi Torre
- Hours
- 120 ore - Luigi Torre
- CFU
- 12
- Course Regulation
- Coorte 2023
- Offered
- 2023/24
- Learning activities
- Caratterizzante
- Area
- Ingegneria dei materiali
- Academic discipline
- ING-IND/22
- Type of study-unit
- Obbligatorio (Required)
- Type of learning activities
- Attività formativa monodisciplinare
- Language of instruction
- Italiano
- Contents
- Introduction., techno polymers, biopolymers, and blends.
Synthesis of polymers. Step polymerization ,Chain polymerization, Copolymerization
Viscoelasticity, Rubber Elasticity.
Rheology and Rheometry.
Structure: Polymer crystals. Tg
Characterization of Polymers: thermal analysis
Mechanical properties
Solubility and absorption of polymers.
Processing Recycling and reuse of polymeric materials, - Reference texts
- Fondamenti di struttura, proprietà e tecnologia dei polimeri a cura di Enrico Pedemonte http://nuovacultura.it/catalogo/fondamenti-struttura-proprieta-tecnologia-dei-polimeri/
R. J. Young and P.A. Lowel: Indroduction to Polymers. Chapman ed.
F. Rodriguez: “Principles of Polymer Systems” Mc Graw Hill - Educational objectives
- Provide the student with knowledge on the main aspects of the characteristics, properties and technologies of polymeric materials. Starting from the definitions and chemical-physical characteristics of polymeric materials, the synthesis processes of polymers, their properties, characterization and their behavior will be studied. Finally, the main processes for the production and recycling of polymeric products will be studied
- Prerequisites
- Material Science and technology, Chemistry Physcics and Math
- Teaching methods
- Frontal lessons and exercises
- Learning verification modality
- Written and Oral Exam, Midterm examination
- Extended program
- Introduction. Structure, and classification: thermoplastic polymers, thermosetting polymers, homo and co-polymers, molecular weight and molecular weight distribution. commodity polymers, techno polymers, biopolymers, and blends.
Synthesis of polymers.
Step polymerization: Introduction, reaction mechanism. Carothers theory, Flory theory (most probable distribution), kinetics, poly-condensation: Carothers gelling theory and Flory gelling theory.
Chain polymerization: Reaction mechanism, kinetics, activation energy, average degree of polymerization, self-acceleration, chain transfer, effects of temperature, inhibition and delay.
Copolymerization: Classification of copolymers. Composition equation of a copolymer, fa-Fa plot. Azeotrope blend. Determination of the amount of unreacted monomer.
Viscoelasticity: Definitions. Variation of stress and strain over time. Maxwell model; Voigt (or Kelvin) model; Standard Linear Solid. Boltzman superposition principle.
Viscoelasticity: Dynamic-Mechanical tests. Torsion pendulum. Frequency dependence of viscoelastic behavior. Transitions and polymeric structures.
Rheology and Rheometry: rheological behavior of polymers viscosity measurement of polymer melts, time temperature superposition principle, WLF equation.
Structure: Polymer crystals. Determination of the crystal structure. Semi-crystalline polymers, spherulites, degree of crystallinity, crystal thickness and orientation, thermodynamics of crystallization and molecular mechanism, Hoffman theory. Avrami law. Melting, factors affecting the meting temperature
Structure. Amorphous polymers. Free volume theory and glass transition, Gordon-Taylor equation for copolymers. Dependence of Tg on the chemical structure, elastomers
Characterization of Polymers: thermal analysis Thermogravimetry, calorimetry, dilatometry, examples and equipment
Mechanical properties: “Yield” of polymers phenomenology, necking, pressure-dependent yield criteria. Dependence on strain rate and temperature
Solubility and absorption of polymers: Fickian diffusion and Case II, solubility criteria for polymeric materials, solubility parameter, Flory Huggings theory.
Processing. Production processes of polymeric materials, Extrusion and co-extrusion basic concepts and operation. Fiber spinning and Filming: equipment and process modeling examples. Injection molding: principles of operation and main industrial problems.
Recycling and reuse of polymeric materials, problems and main techniques. - Obiettivi Agenda 2030 per lo sviluppo sostenibile
- 9