Monitoring the Isothermal Crystallization Kinetics of PET-A Using THz-TDS

Using terahertz time-domain spectroscopy (THz-TDS), we monitor the isothermal crystallization kinetics of amorphous polyethylene terephthalate (PET-A). PET-A was tempered at different temperatures and for a varied amount of time to induce a isothermal crystallization. Afterwards the THz spectra were recorded and analyzed. An adapted Avrami equation was used to analyze the spectral data to monitor the isothermal crystallization. It was found that the adapted Avrami theory is a good approach to describe the kinetics of isothermal crystallization and allows to determine kinetic parameters as with classical technologies. Therefore, we conclude that THz-TDS offers a non-destructive method to characterize the kinetics of isothermal crystallization in polymers.

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