Question:
Vulcanization of rubber does not increase the
Vulcanization of rubber does not increase the
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Think of vulcanization as turning "spaghetti" (loose chains) into a "net" (cross-linked). A net is bouncy (elastic) and tough (hard), but it doesn't stay stretched out like soft dough (plastic).
Updated On: May 20, 2026
- elasticity
- hardness
- rigidity
- plasticity
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The Correct Option is D
Solution and Explanation
Concept:
Vulcanization is a chemical process involving the heating of natural rubber with sulfur. This creates cross-links (sulfur bridges) between the long polymer chains, transforming the material from a thermoplastic to a thermoset-like elastomer.
Step 1: Analyze the effects of cross-linking.
Cross-linking restricts the ability of polymer chains to slide past one another. This results in:
• Increased Hardness/Rigidity: The structure becomes more robust.
• Increased Elasticity: The chains can stretch but are pulled back to their original position by the sulfur bridges.
• Decreased Water Absorption: The network is more "tight."
Step 2: Identify the property that decreases.
Plasticity refers to the ability of a material to undergo permanent deformation without breaking. Vulcanization specifically removes plasticity by ensuring the rubber returns to its original shape (elasticity) rather than staying deformed. Therefore, vulcanization decreases plasticity rather than increasing it.
Step 1: Analyze the effects of cross-linking.
Cross-linking restricts the ability of polymer chains to slide past one another. This results in:
• Increased Hardness/Rigidity: The structure becomes more robust.
• Increased Elasticity: The chains can stretch but are pulled back to their original position by the sulfur bridges.
• Decreased Water Absorption: The network is more "tight."
Step 2: Identify the property that decreases.
Plasticity refers to the ability of a material to undergo permanent deformation without breaking. Vulcanization specifically removes plasticity by ensuring the rubber returns to its original shape (elasticity) rather than staying deformed. Therefore, vulcanization decreases plasticity rather than increasing it.
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