Polymers

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  • Polymers
    • Thermo softening
      • Polyethene is an example of this
      • It is made up of individual polymer chains that are tangled together.
        • When it is heated it becomes soft and then hard again when cooled.
          • This means it can be moulded.
    • Thermo setting
      • Do not melt or soften when heated.
        • These polymers set hard when first moulded.
          • Because of strong covalent bonds forming cross links between polymer chains
            • The strong bond holds the chains in position.
    • The properties of polymers depends on the monomers used to make them.
      • Low density polyethene and high density are made using different catalysts and different reaction conditions.
        • HD softens at a higher temp and is stronger than LD

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