The heats of combustion of four polymers, viz., polyoxymethylene (Delrin), polymethylene, polyethylene (Marlex), and polypropylene, have been accurately measured. From these results the changes in enthalpy and free energy have been calculated for ( a ) the process of forming the respective polymer units from the elements and ( b ) the process of forming these polymers from their monomer building blocks.
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Parks et al. (1963) studied this question.
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