The thermal properties of samples were determined,
using a BAHR-Thermoanalyse GmbH (Hullhorst, Germany) employing,
heating and cooling rates of 10 8C min1 and using a condenser as
the coolant. The samples were weighed as a thin film and carefully
packed into a clean aluminum pan (11.5–12.5 mg), and sealed by
crimping an aluminum lid on the pan (Shimadzu universal crimper).