Crystal structure and polymorphism
Static crystallization at room temperature 22-23 oC at
different crystallization times (4, 12, and 60 days) was applied to
crystallize blends before X-ray analysis. The crystal structure and
polymorphic form of solidified samples were analyzed by X-ray
diffraction (Multiflex Powder X-ray spectrometer, Rigaku, Tokyo, Japan).
The copper X-ray tube (wavelength of 1.54 Å) was operated at 40 kV and
44 mA. The measurement scan rate was set at 0.3 per minute in the range
2θ=1-30 at 20 oC. The diffracted peak positions were
determined using MDI Jade 9 (MDI, Livermore, CA, USA) software.