GATE XE · 2025 · XE-F
Question 126: Chemistry of high polymers
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Question 126
XE-FMSQ2 marksNeeds review
The crystallization of a polymer can only proceed in a temperature range limited to glass transition temperature (T_g) on the lower side, the equilibrium melting point (T_m^o) on the higher side. Around T_g, the mobility of the polymer chains is lower, while in the proximity of T_m^o, crystallization is inhibited.
In a miscible polymer blend with only one component being crystalline, which option(s) correctly match(es) the Temperature conditions with Events?
Temperature conditions: P — The T_g of the amorphous component is lower than the crystallizable one; Q — The T_g of the amorphous component is higher than the crystallizable one; R — The blend T_g is higher than the T_m^o of the crystallizable one.
Events: 1 — The temperature range over which crystallization can occur becomes smaller; 2 — Crystallization is inhibited; 3 — The crystallization envelope (T_m^o − T_g) is widened; 4 — Crystallization is favored.
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2025XE-F
GATE XE 2025 · Paper 1
Engineering Sciences · Original paper archive
- Section
- Section XE-F
- Question type
- Multiple select (MSQ)
- Marks
- 2 marks
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