Figure 4. DSC heating traces of i-PS melt-crystallized for 5 hours at different temperatures listed. Each sample was quenched to 80°C and stabilized before scanning at 10°C/min. Each trace is plotted on the same scale but y-shifted for presentation. Apparent baseline shift around 100°C is the glass transition.

From

Experiment to Teach Multiple Melting Phenomena in Semicrystalline Polymers Using Differential Scanning Calorimetry

Kathy L. Singfield, Ashley J. Rowe

World Journal of Chemical Education. 2021, 9(3), 68-76 doi:10.12691/wjce-9-3-1