Polymers

Polymers

1. Means joining together of small chain molecules to form very large molecules

   • Small molecules are also known as monomers

2. Polymerisation requires;

   • High temperature
   • High pressure
   • Passed over a catalyst

3. Thermosoftening

   • Don't have cross links
     • Intermolecular forces are easily overcome as they are weak
     • Free to slide over eachother
   • Easy to shape and melt

4. Thermosetting

   • Have crosslinks
     • Strong intermoleculr forces which give it its solid structure
   • Doesn't soften when heated
     • Strong' hard and rigid

5. Uses

   • Plastic bags
     • Light and stretchable low density polymers
   • Tooth fillings
     • Some polymers are waterproof
   • Memory foam
     • Gets softer as it gets warmer
       • Mould to shape
     • Smart material