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In a block copolymer the two kinds of unit are arranged as

  • A.a random sequence with no order at all
  • B.long runs of each along one chain
  • C.strictly alternating single units
  • D.branches of one grafted onto a chain of the other

Answer: B

The incompatible blocks segregate into separate domains, which is what makes a thermoplastic elastomer behave as a rubber yet melt for processing. A graft copolymer instead hangs one polymer as side chains from the other.

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