After completing this topic you should be able to : State what is meant by: monomer, polymer and polymerisation. Give examples of plastics formed from.

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After completing this topic you should be able to : State what is meant by: monomer, polymer and polymerisation. Give examples of plastics formed from alkenes. Explain, using full structural formulae, how ethene forms polythene. State the name of the polymer made from an alkene, given the name of a monomer and vice-versa.

Plastics and synthetic fibres are made from g gg giant molecules. join together C H H CHH

C H H CHH C H H CHH C H H CHH The C=C breaks open allowing the molecules to join. CHH CHH CHH CHH CHH CHH

The following table lists the advantages & disadvantages of polymers. ADVANTAGES DISADVANTAGES Cheap to make and makes lots of different structures. Very durable and don’t need maintenance. Light weight and very strong. Good insulators of both heat and electricity. Some polymers do not melt on heating. Large variety of properties, which allows them to be matched to their use. Made from molecules from crude oil, which are non-renewable. Non-biodegradable is a problem when dumped. Discarded polymers kill animals. Some polymers are very flammable and make very poisonous fumes when burned. Mixed types of polymer waste can be difficult to recycle.