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Plastics - PowerPoint PPT Presentation


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Plastics. A plastic is a substance which can be shaped or moulded. The Raw Material for plastics is Crude Oil. Plastics are types of polymers. Polymerisation.

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Presentation Transcript
plastics
Plastics
  • A plastic is a substance which can be shaped or moulded.
  • The Raw Material for plastics is Crude Oil.
  • Plastics are types of polymers.
polymerisation
Polymerisation
  • Polymers are long chain molecules made up by many small individual building blocks,called Monomers, joining together.

Monomers

Polymer Molecule

addition polymers
Addition Polymers
  • For an Addition Polymer to be formed the Monomers must have a C=C double bond.
  • Examples: Polythene: Made from many ethene molecules joining together. CH2=CH2 + CH2=CH2+ CH2=CH2(ethene)

-(CH2-CH2-CH2-CH2-CH2-CH2)n- (Polythene)

other examples of monomers
Other examples of Monomers
  • Polychloroethene.(better known as PVC,polyvinyl chloride). -CH2=CHCl-
  • Polytetrafluoroethene.(PTFE)ie Teflon -CF2=CF2-
  • Polyphenylethene.(polystyrene) -CH2=CHC6H5-
recycling plastics
Recycling Plastics
  • Plastics can be difficult to Recycle.
  • Some plastics can be melted and reshaped, however others can’t.
  • Plastics are said to be Non-Biodegradable ie. They cannot be broken down by Bacteria in the soil.
  • Plastics can give off poisonous fumes such as CO, HCN and HCl when burned.
effect of heat on polymers
Effect of Heat on Polymers
  • Polymers that soften on heating and Harden when cooled are called Thermoplastic. Examples are Polythene, PVC, polypropene etc.
  • Some polymers are largely unaffected by heating. These are known as Thermosetting Polymers. Their Structure is such that they contain Cross-Links between the long polymer chains. Examples are Bakelite and Mica.