Question:
Among the options given, which agents are used to vulcanize or cure rubbers?
Among the options given, which agents are used to vulcanize or cure rubbers?
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Remember: \textbf{Sulfur} and \textbf{organic peroxides} are the main vulcanizing agents. Carbon black is reinforcing, zinc stearate is a lubricant.
Updated On: Aug 29, 2025
- Dicumyl peroxide
- Zinc stearate
- Carbon black
- Dinitrobenzene
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The Correct Option is A, D
Solution and Explanation
Step 1: Recall vulcanization.
Vulcanization of rubber involves formation of cross-links to improve elasticity, strength, and thermal stability. Traditionally sulfur is used; alternatively, organic peroxides act as curing agents.
Step 2: Role of dicumyl peroxide.
Dicumyl peroxide decomposes under heat to form free radicals, which abstract hydrogen atoms from polymer chains and create C–C crosslinks. Hence, it is a curing/vulcanizing agent.
Step 3: Eliminate other options.
- Zinc stearate: lubricant/release agent, not a curing agent.
- Carbon black: reinforcing filler, improves strength but not a vulcanizing agent.
- Dinitrobenzene: not used in rubber curing; toxic aromatic compound.
Step 4: Conclude.
Only dicumyl peroxide functions as a vulcanizing/cross-linking agent. Final Answer: \[ \boxed{\text{Dicumyl peroxide (A)}} \]
Vulcanization of rubber involves formation of cross-links to improve elasticity, strength, and thermal stability. Traditionally sulfur is used; alternatively, organic peroxides act as curing agents.
Step 2: Role of dicumyl peroxide.
Dicumyl peroxide decomposes under heat to form free radicals, which abstract hydrogen atoms from polymer chains and create C–C crosslinks. Hence, it is a curing/vulcanizing agent.
Step 3: Eliminate other options.
- Zinc stearate: lubricant/release agent, not a curing agent.
- Carbon black: reinforcing filler, improves strength but not a vulcanizing agent.
- Dinitrobenzene: not used in rubber curing; toxic aromatic compound.
Step 4: Conclude.
Only dicumyl peroxide functions as a vulcanizing/cross-linking agent. Final Answer: \[ \boxed{\text{Dicumyl peroxide (A)}} \]
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