2.5. Powder X-ray diffraction spectroscopy (XRD)
Polymorphic behavior of the blends was investigated by XRD using
a Bruker D8-Advance Diffractometer (Bruker, Germany) (λ Cu=
1.54178 Å, 40 kV, 30 mA) equipped with an Anton Paar temperature
control system composed of a TTK450 low-temperature chamber
connected to a water bath and heating device (TCU 110 Temperature
Control Unit) (Anton Paar, Graz, Austria). Just as for the DSC
measurements, the samples were first heated to 80 °C and held at that
temperature for 10 min to ensure complete melting and to erase the
crystalmemory. After that, the samples were cooled to the crystallization
temperature and short-spacing runs (15–27° 2θ) were performed using
a Vantec-1 detector every 2 min during the isothermal
time (90 min).