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Discussion

In free radical addition polymerisation the initiator's role is to

  • A.terminate the chains at a chosen length
  • B.dissolve the monomer in the reaction medium
  • C.remove the small molecule eliminated at each step
  • D.generate radicals that start the chains

Answer: D

Benzoyl peroxide or azobisisobutyronitrile decomposes thermally to radicals that attack the monomer's double bond and begin propagation. It is consumed rather than recovered, so it is not a catalyst in the strict sense.

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