Relaxation phenomena in supercooled liquid and glassy acetaminophen studied by dielectric, photon correlation and Brillouin light scattering spectroscopies

► We investigate relaxation phenomena and acoustic properties of amorphous acetaminophen. ► Dielectric and photon correlation data reveal two low-frequency relaxation processes. ► Amorphous acetaminophen exhibits clear change at the glass transition temperature. ► Crystallization affects the Brillouin spectrum substantially in correlation with the decrease in the dielectric strength.