| http://www.w3.org/ns/prov#value | - The chain extender may be any diol, or combination of diols, containing 2 to 10 carbon atoms, such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexane-dimethanol, hydroquinone di(hydroxyethyl)ether, or any aliphatic or aromatic molecule containing two reactive hydroxyl groups.
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