Polymers
- Created by: Laurenskye
- Created on: 28-03-16 20:48
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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.
- When it is heated it becomes soft and then hard again when cooled.
- 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.
- Because of strong covalent bonds forming cross links between polymer chains
- These polymers set hard when first moulded.
- Do not melt or soften when heated.
- 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
- Low density polyethene and high density are made using different catalysts and different reaction conditions.
- Thermo softening
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