  This paper reports the first example of the degradable ROMP thermosetting
materials catalysed by bio-derived acids and cutinase from Thermobifida
cellulosilytica (Thc_Cut1). The ROMP thermosetting materials are based on
norbornene dicarboximides containing acetal ester groups only in the crosslink
moiety. The insoluble cross-linked materials were subjected to acid-catalysed
hydrolysis using bio-derived acetic and citric acids as well as enzymatic
degradation using Thc_Cut1, resulting in the materials becoming completely
soluble in dichloromethane. 1H NMR and rheological analysis performed on
materials after acid-catalysed hydrolysis showed characteristics
indistinguishable to that of the linear polymer analogues. These analyses
confirmed the cleavage of the crosslink moiety upon degradation with the main
backbone chains remaining intact. The glass transition temperatures of the
polymer materials after acid-catalysed hydrolysis were the same of those
observed for the linear polymer analogue. TGA showed that the cross-linked
polymers thermally stable to 150 {\deg}C, beyond which showed weight losses due
to the thermal cleavage of the acetal ester linkages.
