PSC 480/740 Kinetics. 2. Thermodynamics of Polymerization (continued). Since most polymerizations are characterized by an exothermic propagation reaction and an endothermic depropagation reaction, the activation energy for the depropagation reaction is higher, and its rate increases more with increasing temperature compared to the propagation reaction. As shown below, this results in a ceiling temperature, defined as the temperature at which the propagation and depropagation reaction rates ar224
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