Polymers
- Created by: rubyboast
- Created on: 04-11-18 11:15
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- 1.1.2 Polymers
- Thermoplastic
- A material which can be repeatedly reshaped and reheated, allowing it to be recycled after original use
- Have long linear chain molecules and can be held by van der Walls forces
- Examples
- nylon
- polypropolene
- high impact polystyrene
- Low/ high density polyethylene
- Thermosetting plastic
- A material which when heated undergoes a chemical change whereby molecules form rigid cross links
- They cannot be reheated or reshaped, even at a very high temperature
- Examples
- Polyester resin
- Melamine formaldehyde
- epoxy resin
- Urea formaldehyde
- Elastomer
- A material which at room temperature can be deformed under pressure and then upon relase of pressue, will return to its original shape
- Have weak bonds which allow them to stretch easily
- Examples
- Neoprene
- Polybutadiene
- Silicone
- Natural rubber
- Thermoplastic
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