Polymers C2
Quick all you need to know styled mindmap with the most useful information from BBC Bitesize, Collins AQA revision guide and some other notes...
- Created by: jatyization
- Created on: 31-03-13 22:39
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- Polymers
- Thermosoftening
- Easy to recycle
- Soften when heated
- Can be shaped when hot
- Tangle of smooth chains
- Easier for molecules to slide past each other and melt
- Flexible material
- No Cross Links
- Thermosetting
- Links to other chains and more side chains
- Hard for chains to slide at all, SO IT CANNOT MELT
- Hardens when heated
- Cannot be reshaped
- Harder to recycle
- Links to other chains and more side chains
- Intermolecular Forces
- Polymer Molecules are long covalent chains made from carbon atoms
- Intermolecular forces are weak between molecules but because the molecules are so large, the intermolecular force is greater
- Gives them a higher melting point than expected
- Thermosetting polymers melt over a range of temperatures
- HDPE & LDPE
- HDPE is used for plastic bottles and water pipes
- LDPE used to make film and plastic bags
- HDPE and LDPE is made from the same monomer
- but by different catalysts, temperatures and pressures they create two different polyethenes with different properties
- Thermosoftening
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