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The main related influences that affect chemical aging processes are temperature, time, oxidative, and hydrolytic processes. In addition to these irreversible changes of the polymeric structure, reversible changes of the physical properties of the polymer have to be considered.
Thus, metabolism of nitrogen-containing substances in the rumen was dependent upon seasonal factors, as were hydrolytic processes in the rumen.
This noticeable torque drop is probably related to the action of by-products of chain extension reactions that can accelerate hydrolytic processes, breaking ester bonds and reducing the molecular weight of the blend components.