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Low-density polyethylene differs from the high-density grade in being

  • A.cross-linked into a rigid network
  • B.of a much higher molecular mass in every case
  • C.branched and therefore less crystalline
  • D.linear and therefore more crystalline

Answer: C

Chain transfer during high-pressure free radical polymerisation produces side branches that stop the chains packing closely. The coordination-catalysed grade is linear, packs well and is stiffer and stronger as a result.

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