where r RC.+O 2 r RC. add +r RC.+O 2 represents the probability of a carbon-center growing chain transitioning into an oxygen-center growing chain during elongation, while 1 -α ROO. represents the probability of an oxygen-center growing chain not elongating. Fig. (a) to (d) show the computed values of α RC. , α ROO. , α R. , and the corresponding ASF distribution for α R. in the liquid-phase system. In Fig. (a), α RC. is represented by two components: the elongation probability through monomer addition (α RC. add ) and the elongation probability by combining with dissolved oxygen to form an oxygen-center propagation chain. It can be observed that in the colder section, where the oxygen concentration is relatively higher, the carbon-center propagation chains have a greater likelihood of elongating by combining with dissolved oxygen (Fig. ). This transformation leads to the formation of peroxyl propagation chains with higher elongation probabilities (Fig. ).