Swelling tests were performed in toluene in accordance
with ISO 1817. Cured test pieces (30 mm 5 mm 2 mm)
were weighed using an electrical balance and swollen in
toluene until equilibrium, which took 72 h at room
temperature. The samples were removed from the liquid,
the toluene was removed from the sample surfaces, and the
weight was determined. The change in mass is as follows: