Discussion

Select the correct option to match the Characterization technique with the Information that is obtained using these techniques.

Characterization technique		Information
P	Differential scanning calorimetry	I	Spherulite size
Q	Infrared spectroscopy	II	Loss modulus
R	Dynamic mechanical thermal analysis	III	Functional groups
S	Optical microscopy	IV	Enthalpy of crystallization

Answer: C

The correct matching is P-IV ; Q-III ; R-II ; S-I.

Differential scanning calorimetry measures heat flow, so the area of the crystallisation peak gives the enthalpy of crystallisation (IV).
Infrared spectroscopy identifies functional groups from their characteristic absorption bands (III).
Dynamic mechanical thermal analysis applies an oscillating load and measures the storage and loss moduli and tan delta (II).
Optical microscopy, usually between crossed polarisers, shows spherulites and their size (I).

Option A swaps DMTA and microscopy; options B and D swap DSC and IR.

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