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Ziegler Natta catalysts were important because they allowed

  • A.condensation polymers to be made faster
  • B.polymers to be crosslinked in the mould
  • C.polymers to be made without a monomer
  • D.stereoregular polymers at low pressure

Answer: D

Isotactic polypropylene, which is crystalline and useful, cannot be made by free radical polymerisation at all. The discovery opened up a whole class of commodity plastics. Metallocene catalysts refined the idea further.

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