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Homework Help: Polymer Question

  1. Apr 20, 2010 #1
    1. The problem statement, all variables and given/known data
    How would the polymer of 2-chloro-2-butene look when formed by addition polymerization


    2. Relevant equations



    3. The attempt at a solution
    I have attached my solution. Please tell me if i am right/wrong and why if it is wrong.
     

    Attached Files:

  2. jcsd
  3. Apr 21, 2010 #2

    chemisttree

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    What does the initiator end of the molecule look like? How is the process terminated? What does the other end of the molecule look like?
     
  4. Apr 21, 2010 #3
    Initiation:

    I* + CH2=CCl-CH2-CH3--> I-CH2-CHCl*-CH2-CH3


    How is that for initiation step? where I is initiator and * is radical sign
     
  5. Apr 22, 2010 #4

    chemisttree

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    You drew 2-chloro-1-butene. How about the 2-butene version? Do you think you will need to show the end groups in your answer? (I honestly don't know)
     
  6. Apr 22, 2010 #5
    I* + CH3-CCl=CH-CH3--> I-CH2-CCl*-CH2-CH3

    And i am not sure what the "end groups" you are referring to are.
     
  7. Apr 22, 2010 #6

    chemisttree

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    I* + CH3-CCl=CH-CH3 --> (CH3)(Cl)(I)C-C*(Cl)(CH3) Step 1 (not a polymer yet)

    The end groups are (CH3)(Cl)(I)C- in the example above. It will always be at the end of the new polymer, thus 'end group'. What about the other end?
     
  8. Apr 22, 2010 #7
    I don't understand where you got the 2nd chlorine atom from
     
  9. Apr 22, 2010 #8

    chemisttree

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    You're right. Should be....

    (CH3)(I)C-C*(Cl)(CH3)

    and....

    The end groups are (CH3)(I)C- in the example above.
     
    Last edited: Apr 22, 2010
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