It might lower the rate of biodegration but not completely stop it. both ethylene glycol and choline choliride are, biocompatible, and relatively common molecules.
there are 2 possible mechanisms for pure EG:
Steric locking of the cellulose crystals, the EG enters the space in between the sugars of the cellulose chain and makes an hydrogen bond, this is a non binding interaction. since the EG will not evaporate like water the celullose and chitin become fixed in certain positions. Thus making a stiffer material
In presence of choline Chloride, a mild base. We might be seeing some increased crosslinking. The acidic H in the celullose and chitin become reactive and bind to each other or to the EG. Effectively increasing the binding between cellulose and chitin.