prov:value
| - Examples of chain extenders usable in the present invention include glycols such as ethylene glycol, 1,4-butanediol, 2,3-butanediol, bisphenol A dihydroxyethyl ether, hydroquinone dihydroxyethyl ether, etc., and diamines such as diphenylmethanediamine, m-phenylenediamine, etc.
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