Question

The differential scanning calorimetry gives
A. crystallization temperature $(T_{c})$
B. glass transition temperature $(T_{g})$
C. dyeing temperature $(T_{dv})$
D. melting temperature $(T_{m})$ Choose the correct answer from the options given below:

• A. B, C, D only
• B. A, C, D only
• C. A, B, D only
• D. A, B, C only

Hint:

DSC is the "thermometer" of polymer structure. If the polymer molecules move, freeze, or melt, the DSC will record the exact temperature it happened.

Answer 1

The Correct Option is C

Concept: Differential Scanning Calorimetry (DSC) is a thermo-analytical technique that measures the difference in the amount of heat required to increase the temperature of a sample and a reference as a function of temperature.

Step 1: Identifying Thermal Transitions.
DSC is primarily used to detect phase transitions. It identifies:
• B (Glass transition temperature - $T_g$): Seen as a step-change in the baseline.
• A (Crystallization temperature - $T_c$): Seen as an exothermic peak (heat released).
• D (Melting temperature - $T_m$): Seen as an endothermic peak (heat absorbed).

Step 2: Exclusion.
C (Dyeing temperature) is a process parameter determined by the dye-fiber system and kinetic studies, not a fundamental thermodynamic phase transition measured by DSC.