Rheological properties of the neat polymers and polymer blends were characterized using a Discovery Hybrid Rheometer HR-2 (TA Instruments, Newcastle, DE, USA) equipped with an Environmental Test Chamber (ETC) and an air chiller system. A plate-plate setup with an upper 25 mm plate was used for the measurements. Flow sweeps of the prepared samples within a shear rate range from 1 to 100 s -1 were measured from 180 to 120 °C (for the drug loaded samples and to 150 °C for the samples without IND) in 5 °C steps. Before every measurement, the samples were equilibrated at the measurement temperature for 10 min. To facilitate comparison of the temperature dependency of different samples, the measured viscosity at a shear rate of 10 s -1 was plotted against the temperature. The data were analysed using Origin software.