Polymers
- Created by: jaaaz_v
- Created on: 04-05-15 13:18
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- Polymers
- The properties of polymers depend on what they're made from and the conditions that they're made in
- Strong covalent bonds hold the atoms in polymer chains together
- The bonds inbetween the chains determine the properties of the plastic
- Weak forces
- Individual tangled chains
- The chains are held together by weak intermolecular forces
- The chains can slide over each other
- Thermosoftening polymers have forces that are easily overcome
- When cooled, they harden into a new shape
- Can be remolded as many times as you want
- Strong forces
- Strong intermolecular forces inbetween chains
- The forces are called crosslinks
- Hold the chains firmly together
- Thermosetting polymers have crosslinks
- Hold the chains together in a solid structure
- Polymer doesn't soften when heated
- Polythene
- High density
- Made at lower temperatures and pressures with a catalyst
- More rigid than low density polythene
- Used for water tanks and drainpipes
- Low density
- Made at 200 degrees under high pressures
- Flexible
- Used for plastic bags and bottles
- High density
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