prov:value
| - Illustrative of such polymers are those having repeating structural units of the formula that result from the condensation of a dicarboxylic acid or a derivative thereof, e.g., a salt, acyl halide, or ester of such an acid, with a diamine, wherein the Rs, which may be the same or different, are hydrogen or monovalent organic radicals, e.g., lower alkyl such as methyl or ethyl, and the Ys, which al
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