Organic Chemistry Plus Masteringchemistry With Pearson Etext, Global Edition
Organic Chemistry Plus Masteringchemistry With Pearson Etext, Global Edition
9th Edition
ISBN: 9781292151229
Author: Wade, LeRoy G.
Publisher: PEARSON
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Chapter 26.2C, Problem 26.9P

Chain branching is not as common with anionic polymerization as it is with free-radical polymerization and cationic polymerization.

  1. a. Propose a mechanism for chain branching in the polymerization of acrylonitrile.
  2. b. Compare the relative stabilities of the intermediates in this mechanism with those you drew for chain branching in the cationic polymerization of styrene (Problem26-6). Explain why chain branching is less common in this anionic polymerization.
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Please show the product and mechanism for the cationic polymerization of 2-butene using BF3/H2O to catalyze polymerization. Do you expect this to be an effective polymerization strategy for this monomer? Why or why not?
Give a single benefit for each polymerisation from carrying them out under a nitrogen atmosphere? (d) Of the two polymers produced (A and B) one had Mn = 12,000 and a polydispersity of 1.1 and one a Mn = 11, 200 and a polydispersity of 1.7. Identify which set of molecular weight parameters corresponds to which polystyrene sample.
4. The following reaction scheme shows the radical polymerization of styrene to make polystyrene. a) Add electron-pushing arrows to show the mechanisms of steps 1-3. Determine if these are initiation, propagation, or termination steps. b) Radical polymerization is often performed in the absence of O2 because the oxygen radical can couple with the polymer radical to terminate polymerization. Propose electron-pushing arrows for step 4 and predict the product of that step.
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