Melting Enthalpy of Perfect Polymer Crystals by DSC

The melting enthalpy of perfect polymer crystals, AH, can be obtained using DSC and a hot stage equipped with a polarizing microscope, when the equilibrium melting point of the sample is known. The procedure for the measurement of AHf is recommended as follows  

The temperature and enthalpy of DSC should be calibrated following standard procedures. The temperature of the hot stage is calibrated by using a pure crystal with known melting temperatures. 

Place a small piece of the film of crystalline polymer between two glass covers and melt the sample on a hot-plate. 

Transfer the sample with the glass covers rapidly into the hot stage whose temperature 

Quench the sample to room temperature, cut it and then place a piece of the sample ( about 8-10 mg) in the DSC pan. 

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