The water content in all obtained products was measured with a TitroLine 7500 KF trace apparatus (SI Analytics, Germany) using the Karl Fischer titration method according to the previously described procedure. Differential scanning calorimeter (DSC) was performed on DSC 209 F1 Phoenix unit (Netzsch, Germany. Samples between 5 and 20 mg were placed in platinum pans and were heated from 25 to 120 °C at a heating rate of 10 °C min -1 and cooled at a cooling rate of 10 °C min -1 to -80 °C. After that, samples were heated again to 120 °C and subsequently cooled to 25 °C.