Polymers
- Created by: markalex
- Created on: 14-01-15 17:33
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- Polymers
- Where are polymers used
- Polymers are organic compounds with long- chain molecules.
- THe chains are made by thousands of small molecules ( callede monomers) joing together in a chemical reaction
- There are strong covalent bonds between the atoms in each chain and weaker forces between the separate chains
- Although we see plastics polluting our environment , biodegradable alternatives are more costly and denser
- Types of polymer
- Thermoplastic
- The most widely used plastic is polyethene. it is a thermoplastic polymer.
- It's realtivley weak intermolecular bond allow it to deform and flow when put under tension
- A thermoplastic is flexible and softens when heated, so it is easy to shape and mold
- Thermosetting
- This is like vulcanised rubber, has strong cross-links between it's polymer chains
- Additives like sulfur modify the properties of rubber by forming cross-links between the individual polymer chains
- Thermoplastic
- Properties of polymers
- Are flexible
- Have a low densitry
- Have a low thermal conductivity
- Where are polymers used
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