ESO has been polymerized by ring-opening polymerization
using the super acid, HSbF6·6H2O catalyst in ethyl acetate solution.
The polymerization was employed at mild conditions such
as room temperature. The formed SA-RPESO polymers have been
found to be typical cross-linked polymers. They have Tg values ranging
from
−13 ◦C to
−21 ◦C because of the long fatty acid chains in
the triglyceride molecules. TGA analysis have shown all of the SARPESO
polymers appear to be thermally stable at temperatures up
to 200 ◦C, and decomposition temperature has been found mainly
above 340 ◦C. GPC results show the extracted SA-RPESO soluble
substances are oligomers of ESO.