2.2. Separation general procedure
A mixture of PE–Al composites (1.5 g) and the corresponding
solvent (200 mL) were stirred at reflux temperature for 6 h. The
mixture was cooled to room temperature and the organic solvent
with PE films samples was separated by decantation. The aluminum
residue was washed with hot solvent and filtered. The organic fractions
were joined and the solvent was removed under vacuum, and
the resulting PE films were dried under vacuum for 24 h. After drying,
0.1 mmfilms were obtained. The yield percentage of recovered
PE was obtained by difference of starting and final quantities of
introduced samples, and by direct weighing of separated PE films.