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cm26 - The Structure and Properties of Polymers Also known...

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The Structure and Properties of Polymers Also known as Bonding + Properties
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What is a polymer? A long molecule made up from lots of small molecules called monomers.
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All the same monomer Monomers all same type (A) A + A + A + A -A-A-A-A- eg poly(ethene) polychloroethene PVC
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Different monomers Monomers of two different types A + B A + B + A + B -A-B-A-B- eg polyamides polyesters
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Addition polymerisation Monomers contain C=C bonds Double bond opens to (link) bond to next monomer molecule Chain forms when same basic unit is repeated over and over. Modern polymers also developed based on alkynes R-C C - R’
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Copolymerisation when more than one monomer is used. An irregular chain structure will result eg propene/ethene/propene/propene/ethene Why might polymers designers want to design a polymer in this way? (Hint) Intermolecular bonds!
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Elastomers, plastics & fibres Find a definition and suggest your own example of each of these.
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