The Structure and Properties of Polymers. What is a polymer? A long molecule made up from lots of small molecules called monomers.

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Presentation transcript:

The Structure and Properties of Polymers

What is a polymer? A long molecule made up from lots of small molecules called monomers.

All the same monomer Monomers all same type (A) A + A + A + A  -A-A-A-A- eg poly(ethene) polychloroethene PVC

Different monomers Monomers of two different types A + B A + B + A + B  -A-B-A-B- eg polyamides polyesters

What decides the properties of a polymer? Stronger attractive forces between chains = stronger, less flexible polymer. Chains able to slide past each other = flexible polymer. In poly(ethene) attractive forces are weak Nylon has strong bonds, and is a strong fibre

Thermoplastics No cross links between chains. Weak attractive forces between chains broken by warming. Change shape - can be remoulded. Weak forces reform in new shape when cold.

Thermosets Extensive cross-linking formed by covalent bonds. Bonds prevent chains moving relative to each other. What will the properties of this type of plastic be like?

Crystalline polymers Areas in polymer where chains packed in regular way. Both amorphous and crystalline areas in same polymer. Crystalline - regular chain structure - no bulky side groups. More crystalline polymer - stronger and less flexible.

Cold-drawing When a polymer is stretched a ‘neck’ forms. What happens to the chains in the ‘neck’? Cold drawing is used to increase a polymers’ strength. Why then do the handles of plastic carrier bags snap if you fill them full of tins of beans?