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Vulcanisation of rubber introduces

  • A.sulphur cross-links between the chains
  • B.a plasticiser between the chains
  • C.crystalline regions along each chain
  • D.additional isoprene units at the chain ends

Answer: A

The occasional cross-link stops the chains sliding permanently past one another, so the rubber recovers its shape instead of flowing. Strength, elasticity and resistance to solvents and temperature all improve together.

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