Differential Scanning Calorimetry (DSC)
Differential Scanning Calorimetry (DSC)
Differential Scanning Calorimetry (DSC)
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<strong>DSC</strong>: Crystallization Kinetics<br />
�Two step process<br />
� Nucleation<br />
� Crystal growth<br />
�Nucleation may be<br />
� Natural<br />
� Induced (using nucleation agents)<br />
�Thermally influenced process<br />
� Natural nucleation<br />
� Crystal growth<br />
� Modeled by Isothermal Kinetics using the<br />
Autocatalytic Model<br />
<strong>DSC</strong>: Isothermal Crystallization<br />
Procedure<br />
�Heat to 10°C above T<br />
�Hold for 5 minutes to remove local order<br />
�Cool rapidly to below melt onset (DO NOT<br />
OVERSHOOT TEMP)<br />
�Hold isothermally<br />
�Record time to crystallization peak (t )<br />
M<br />
c
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