Question

Explain the purpose of vulcanization of rubber

Answer 1

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Explanation:

Vulcanisation is a chemical process for converting natural rubber or related polymers into more durable materials by the addition of sulphur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links between individual polymer chains.

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Answer 2

Answer:

The tensile strength, toughness and elasticity of natural rubber can be increased by adding 3 to 5% sulphur and heating at 100-150°C, resulting in cross linking of cis-1, 4-polypropene chains through disulphide bonds, S-S.This process is known as vulcanization of rubber. The physical properties of rubber can be changed by controlling the amount of sulphur in the vulcanization process. Rubber made with 20-30% sulphur is hard, 3 to 10% sulphur is little harder and is used in making types and 1 to 3% sulphur is used in making rubber bands.