Tecnology: plastics

Tecnology: plastics

1. Plastics

   • Materials formed by carbon and hydrogen atoms. These chains are polymeters.
   • TYPES: internal formation

2. Plastics

   • Formed by chains of C and H atoms. These chains are polymeters.
   • TYPES: INTERNAL STRUCTURE
     • Thermoplastics
       • Plastics softened by heat. Can be formed and melted any times we want. Polymeters have weak bonds
       • SUBTYPES
         • Polyethylene (PE)
           • -Most common plastic. Good chemical resistance. Non-toxic (food packaging able). Bags, bottles
             • Example:
         • Polystyrene (PS)
           • Lightweigh, transparent. Used in packaging or heat insulation
             • A pen:
         • PVC (ployvinyl chloride)
           • Resistant to abrasion and impact. Used in pipes, cable insulation or for doors, windows
         • Polypropylene (PP)
           • Easy to model and dye. Resistant to solvents, splintering. Used for toys and folders.
         • PET (polythylene terephthalate)
           • Food use, recyclable, trasparent, easy to dye. Also used for bottles
             • A bottle
         • Teflon
           • Resistant to chemicals and high temperatures. Non-stick properties, used for kitchen utensils
           • Example:
         • Polycarbonate (PC)
           • Resistant to impact and heat. Good optical transparency
             • Mobile phone is an example:
     • Thermoset
       • Polymeters criss-cross to form networks. They can be shaped with heat, but not re-melted
       • SUBTYPES
         • Melamine
           • to chemicals and high temperatures. Easy to clean. Coating for wooden boards and kitchResistanten cupboards
           • Example:
         • Bakelite
           • Black plastics, stands heat very well. Breaks down at very high temperatures. Hnadles of kitchen utensils and for electrical accessories
           • Example:
         • Polyster resins
           • Rigid and brittle, strenghthened
           • Example:
     • Elastomers
       • Neoprene:
         • Flexible, insulated and waterproof. Ideal for inmersion suits.
       • Natural or synthetic. Used to make tyres, hoses or rubber bands, because of its elasticity
         • Rubber

Imagens e arquivos do mapa