Thermal Evaluation
Crystallization and melting profiles of CA, CN and MY were obtained with
a DSC Q-2000 differential scanning calorimeter (TA Instruments, New
Castle, DE, USA) equipped with a cooling unit. The DSC equipment was
calibrated with indium. The samples (4-7mg) were hermetically sealed in
aluminum capsules. For the individual components (CA, CN and MY) a fully
melted sample (100°C) was started, a cooling ramp was performed to -70°C
(3°C/min), and then a second heating was performed to 80°C (3°C/min).
For the OGs, a first heating (thermal memory erase) from storage
temperature (20°C) to 80°C (10°C/min) was performed, this from the
thermal results of individual components. This was followed by a cooling
down to 0°C (3°C/min). The temperatures and enthalpies corresponding to
the exotherms were determined with Universal Analysis 2000 Ver. 4.5A
software (TA Instruments-Waters LLC).