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Describe the addition polymerisation of alkenes eg ethene watch

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    this is a point in my syallabus. What exactly should I know?
    It's ccea. But regardless, It is only this point about Polymerisation on it.

    Any tips on what to learn?
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    CH2=CH2 can be polymerised by addition polymerisation to [-CH2-CH2-]
    Which is ethene. However, The hydrogen on the CH2 group could be a, say, Cl atom and so the polymerisation of this would be from :CH2=CHCl ----> [-CH2-CHCl-]
    Simples.
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    (Original post by MedAmy)
    this is a point in my syallabus. What exactly should I know?
    It's ccea. But regardless, It is only this point about Polymerisation on it.

    Any tips on what to learn?
    poly = many

    polymerisation could be addition or condensation

    addition, ie alkenes add together, no more double bonds, you get long chains of saturated carbons, ie polyvinyl chlorine(pvc) formed from vinyl chloroethene

    condensation - water is removed as part of the reaction, typically in formation of polyester/polyamides, ie think formation for ester and amides, water is removed. in the end you get long chains with ester or amide functional groups in your polymer. ie terylene, nylon, etc

    these are best illustrated with general or specific examples, to make it easier to explain.
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    (Original post by shengoc)
    poly = many

    polymerisation could be addition or condensation

    addition, ie alkenes add together, no more double bonds, you get long chains of saturated carbons, ie polyvinyl chlorine(pvc) formed from vinyl chloroethene

    condensation - water is removed as part of the reaction, typically in formation of polyester/polyamides, ie think formation for ester and amides, water is removed. in the end you get long chains with ester or amide functional groups in your polymer. ie terylene, nylon, etc

    these are best illustrated with general or specific examples, to make it easier to explain.
    it just says describe the addition polymerisation reaction with ethene and propene???
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    (Original post by MedAmy)
    it just says describe the addition polymerisation reaction with ethene and propene???
    ooh, i see, then just draw out schematic reaction for ethene and propene, if you could do ethene, then just substitute one of the H on ethene with CH3 group, you get propene.

    these would be addition polymerisation,

    ie n CH2=CH2 ----> [CH-CH-CH-CH]m where m is a subscript indicating how long the chain will be and is therefore a multiple of n, don't think it matters how many.

    Like i said, for propene, replace one H with CH3, you are done!

    hmm, easier than i elaborated earlier.
 
 
 
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