| http://www.w3.org/ns/prov#value | - The chain extenders should have molecular weights of less than 250 and are preferably aliphatic diols containing from 2 to 15 carbon atoms, such as ethylene glycol, 1,3-propanediol, 1,4-butanediol and 1,6-hexanediol, with 1,4-butanediol being the most preferred.
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