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JAMB Chemistry 1985 Question 50

Question 50

Polymers

The function of sulphur during the vulcanization of rubber is to

  1. A.act as catalyst for the polymerization of rubber molecules
  2. B.convert rubber from thermosetting to thermo plastic polymer
  3. C.form chains which bind rubber molecules together
  4. D.break down rubber polymer
  5. E.shorten the chain length of rubber polymer.
Show the answer and explanation

Answer: C (form chains which bind rubber molecules together)

Explanation

In vulcanisation, sulphur atoms form cross-links between neighbouring rubber chains. This makes the rubber harder, stronger and less sticky.