Question:
Which of the following will have highest value of Tg?
Which of the following will have highest value of Tg?
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Bulky side groups increase rigidity and raise the glass transition temperature.
Updated On: Feb 8, 2026
- Polyethylene
- Polypropylene
- Cis polyisoprene
- Polystyrene
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The Correct Option is D
Solution and Explanation
Step 1: Understanding glass transition temperature.
Glass transition temperature (Tg) depends on chain rigidity, bulky side groups, and intermolecular interactions. More rigid chains show higher Tg.
Step 2: Structural comparison.
Polystyrene contains bulky phenyl groups attached to the polymer backbone, which restrict molecular motion and increase chain stiffness compared to other polymers listed.
Step 3: Analysis of options.
(A) Polyethylene: Flexible chains with very low Tg.
(B) Polypropylene: Slightly higher Tg than polyethylene.
(C) Cis polyisoprene: Elastomer with low Tg.
(D) Polystyrene: Correct — Bulky phenyl groups lead to highest Tg.
Step 4: Conclusion.
Polystyrene has the highest glass transition temperature among the given polymers, so option (D) is correct.
Glass transition temperature (Tg) depends on chain rigidity, bulky side groups, and intermolecular interactions. More rigid chains show higher Tg.
Step 2: Structural comparison.
Polystyrene contains bulky phenyl groups attached to the polymer backbone, which restrict molecular motion and increase chain stiffness compared to other polymers listed.
Step 3: Analysis of options.
(A) Polyethylene: Flexible chains with very low Tg.
(B) Polypropylene: Slightly higher Tg than polyethylene.
(C) Cis polyisoprene: Elastomer with low Tg.
(D) Polystyrene: Correct — Bulky phenyl groups lead to highest Tg.
Step 4: Conclusion.
Polystyrene has the highest glass transition temperature among the given polymers, so option (D) is correct.
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