Cork powder (fraction < 0.17 mm) was supplied by Sanvicork
S.A. (Extremadura, Spain), and subjected to thermogravimetric
analysis; in order to study the transformations occurred upon thermal
treatment. With that purpose, ca. 10 mg of cork powder were
placed in a SDT Q600 unit (TA Instruments) and ramped from room
temperature to 750 C at 15C min1 in a flow of N2 (100 cm3 -
min1). Weight loss was continuously monitored to better than
0.1 lg and acquired/manipulated using the TA Instrument Explorer
software.