indicating that the cross-links are in-
deed thermoreversible. However, irreversible di-ester formation
[27,28] occurred for the longer diols and partial evaporation of
the shorter diols out of the rubber. Both effects lowered the level
of cross-linking, which resulted in changes in the rubber proper-
ties. Fortunately, the extent of these effects was not too high to
prevent further reprocessing.