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Plastics

Brs Shiro Espanhol

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Plastics

Definition
- They are man-made materials. Consist of large chain of polimers form linking monomers. The procces is called polymerization.
Classification
- Thermoplastics
  - PET
  - HDPE
  - PVC
  - LDPE
  - PP
  - PS
  - Teflon
  - Metacrylate
  - Cellophane
  - Nylon
- Thermosettings
  - Bakelite
  - Melamine
  - Polyester resin
  - Polyurethane
- Elastomers
  - Neoprene
  - Natural rubber
  - synthetic rubber
How to produce plastics
- Moulding techniques
  - Injection moulding
  - Blow moulding
  - Compresion moulding
- Forming techniques
  - Calendering
  - Extrusion
  - Vacuum forming
Properties
- Phisical
  - Mechanical
    - Hardness
    - Maleable and Ductile
    - Elasticity and Plasticity
    - toughness and brittleness
  - Electrical
    - Electrical conductivity
  - Thermal
    - Thermal canductivity
  - Acoustical
    - sounds conductivity
  - Optical
    - Opacity, transparency and traslucence
- Ecological
  - Toxicity
  - Recyclability
  - Renewability
  - Biodegradability
- Chemical
  - Corrosion
  - Oxidation
  - Permeability