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PLASTICS - Coggle Diagram
PLASTICS
Properties of plastics
depend on their type and on their composition
Strength, elasticity, rigidity and flexibtflty are charactenstics of many plastics
Mechanical
: malleabrlity, ductility, mechanical resrstance
Acoustic
: acoustic insulation
Other properties
: low density, tmpermeabihty
Electrical
: electncal rnsulation
Thermal
:thermal rnsulat ion
Classification of plastics
Thermoplastics
They're made up of weakly formed molecular chains.
Polystyrene
Polythene
...
Polyvinyl chloride (PVC)
Thermostable plastics
Are made from compounds derived from petroleum
Phenohc resins
Melamine Formaldehyde
Polyurethane
Polyester resins
Elastomers
Neoprene
Naturalrubber
Synthetic rubber
Formation techniques
Plastic is available in three different forms: powder, granules and resins.
Lamination
Used to form: worktops, to cover surfaces of kitchen cupboards and drawers
Vacuum forming
Used to form: bathtubs, dashboards, shop signs and egg boxes
Extrusion
Used to form; wrapping, lining for electric cables, tubes and pipes.
Moulding
Used to form: domestic utensils such as buckets and containers, vehicle and aircraft components
Blow
Compression
Injection
Origin and transformation
We can describe plastics as natural or synthetic:
Natural plastics
Obtained directly from raw vegetable matenals or from animal proteins
Synthetic plastics
Are made from compounds extracted from petroleum, natural gas and carbon.
Majority of plastics belong ton this group
The transformation is called polymerisation.
Ecological properties
We can
recycle
plastics
There are three recycling processes
Mechanical recycling
Energetic recycling
Chemical recycling
Plastics are materials formed by polymers.
