*2.7. X-ray Diffraction (XRD) Analysis*

The XRD of biodegradable films was determined using an X-ray diffractometer (D500, Siemens Aktiengesellschaft, Munich, Germany) with a voltage of 35 kV, current of 25 mA, and Cu Kα radiation of 1.5406 Å over a Bragg angular range (2θ) of 5–35◦ [11].
