Figure 5. DSC heating traces of i-PS melt-crystallized at 170°C for 300 min and heated at the different rates listed. Each sample was quenched to 80°C and stabilized before scanning at 10°C/min. Each trace 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