Elastomeric block copolymer

This was a question my professor gave me in which I have a couple of ideas to create a synthetic route which include: Either an anionic or cationic polymerization? If so, I don't think it would be cationic because I can't seem to see if there would be some sort of initiator system and i don't think there could be carbocation formation either from the looks of it. The only feasible conclusion I have come to is that it would be an anionic polymerization where you create a living polymer and react this with a second monomer to create a block copolymer? I could maybe use an organolithium to start the initation with a polar solvent however I don't actually know which monomer to start off with nor how the reaction mechanism would work out. Can someone help me? Thank you very much!

  • $\begingroup$ Should the copolymer units have m,n type subscripts as opposed to being of a specific ratio? $\endgroup$
    – Beerhunter
    Commented Nov 14, 2016 at 20:19
  • 1
    $\begingroup$ sigh It's polyaddition. You don't need any catalyst. $\endgroup$
    – Mithoron
    Commented Nov 14, 2016 at 21:36

1 Answer 1


How about starting with a difunctional isocyanate, adding hydrazine in step 1 and polyethylene glycol in step 2. I would call it an addition polymerization. Your structure does not show the number of repeating units, but that could be largely controlled by varying the monomer proportions.


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