Question:
Which of the following additive is added to control molecular weight?
Which of the following additive is added to control molecular weight?
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Common chain transfer agents include thiols and halogenated compounds.
Updated On: Feb 8, 2026
- Antioxidant
- Antiozonant
- Chain transfer agent
- Plasticizers
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The Correct Option is C
Solution and Explanation
Step 1: Understanding molecular weight control.
Controlling molecular weight during polymerization is important to obtain polymers with desired mechanical and processing properties. This is achieved by regulating chain length.
Step 2: Role of chain transfer agents.
Chain transfer agents terminate growing polymer chains and initiate new ones, thereby controlling the average molecular weight of the polymer formed.
Step 3: Analysis of options.
(A) Antioxidant: Prevents oxidation, not molecular weight control.
(B) Antiozonant: Protects rubber from ozone degradation.
(C) Chain transfer agent: Correct — Directly controls polymer chain length.
(D) Plasticizers: Improve flexibility but do not affect molecular weight.
Step 4: Conclusion.
Chain transfer agents are added to control molecular weight during polymerization, making option (C) correct.
Controlling molecular weight during polymerization is important to obtain polymers with desired mechanical and processing properties. This is achieved by regulating chain length.
Step 2: Role of chain transfer agents.
Chain transfer agents terminate growing polymer chains and initiate new ones, thereby controlling the average molecular weight of the polymer formed.
Step 3: Analysis of options.
(A) Antioxidant: Prevents oxidation, not molecular weight control.
(B) Antiozonant: Protects rubber from ozone degradation.
(C) Chain transfer agent: Correct — Directly controls polymer chain length.
(D) Plasticizers: Improve flexibility but do not affect molecular weight.
Step 4: Conclusion.
Chain transfer agents are added to control molecular weight during polymerization, making option (C) correct.
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