Application of the light heating dynamic DSC to polymeric materials

Light heating dynamic DSC was used to study the melting transition of polyethylene. The results show that melting and crystallization are different phenomena from each other in terms of the complex heat capacity. Frequency dependence of the complex heat capacity was examined from 0.01 Hz to 0.2 Hz. It is found that at the lowest frequency the phase of the complex heat capacity exceeds /2 radians. Thermodynamic considerations were made for the large phase of the complex heat capacity.