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The five fragments present in the polymer structure at arbitrary conversions in the epoxy-carboxylic acid reaction (xE) and in the transesterification reaction (x). Bonds (a) represent half of a diepoxide molecule and bonds (b) represent half of a dicarboxylic acid molecule. The network is built-up by joining bonds (a) to bonds (a) and bonds (b) to bonds (b) with a probability determined by the concentration of corresponding fragments.
