Polymeric foams engineering
- nsulation, Electronics,…Introduction: Foam definition, Natural foams, History of development of polymer foams, Overview of applications (packaging, Furniture, Thermal and Acoustical :
- Classification of foams:
Rigid), Polymer matrix(Linear, Nonlinear,…), Production methods (Batch, Extrusion, Bead foaming Based on morphology (Open cells, Closed cells), Cell size (Ordinary, Micrometer, Nanometer,…), Mechanical properties (Flexible, Semi rigi
- Foam structure:
Cell expansion ratio, Relative density, Cell density (High-Medium –Low-Ultra low), Cell Structure, Cell size (Nano cellular, Micro cellular
- Blowing agents, The importance, How to choose them? Kinds (Chemical & Physical)
- Physics of foaming, Theoretical approaches:
Gas solubility and diffusion, Influence of pressure and temperature on solubility and diffusion
- Theory of nucleation, Cell growth and coalescence, Cell stabilization and cooling
- , Blowing agentsThe effective factors on structure and properties of polymeric foams: Processing methods, Processing conditions (Temperature, Pressure,
Time,…), viscosity, Melt strength
- Melt viscosity and melt strength and their effect on foam forming:
Definition of melt viscosity and melt strength, Determination of these two parameters, the effect of melt strength on foam forming
- Processing methods:
Autoclave (batch) foams, Foam extrusion
- Processing methods:
,.... Foam injection molding, Bead Foam
- Foam structures and their modeling: Spherical, Cubic, Honeycombs,…
- Mechanics of foams: Compression properties, Compression Stress- Strain curve, Compression strength and modulus of foams as a function of relative density
- Different Polymer foams, their specifications and applications:
Thermoplastics (PS, PP, PVC, TPU,…), Elastomers (TPU, PU, EVA,…), , Thermosets (Phenolic, Epoxies,…)
- iDifferent Polymer blends and copolymer foams, their specifications and applications:
Blend systems, Copolymers (PPE/SAN, PPMA/PS, PP/EPR,,…) ,
- Nano foams:
Introduction to foams including nanoparticles as nanoclay, nanotubes, graphen,.., Nanoparticles as nucleating agent, Production of conductive foams
- Influence of particle type and concentration on cell structure (Reduction of thermal conductivity, expansion ratio
- Environmentally friendly foams:
Bio-based and bio-degradable foams (PLA, PHBA and starch foams) , Foams with halogen-free flame retardants Recyclable foams
- Foam Core Sandwich Structures:
Principles and mechanics, Components (Face sheets, core, adhesive line), Typical Applications
- Reduction of thermal conductivity:
Small cell size (Knudsen effect)
Type of gas (lower thermal conductivity gas)
Lower contribution of IR (IR attenuating fillers)
- Properties and Testing:
Mechanical properties (Compression, Shear and Flexural properties), Thermal conductivity (insulation behavior), Impact strength and energy adsorption
- Structural properties (Density, Open cell content, Surface roughness), Influence of density, cell size and material type on different properties
- Recent trends in development of new foams
- Seminars of students on Recent trends in development of new foams