In FRP, chain propagation reactions do not alter the number of active radicals but consume a single monomer, and their occurrence frequency is significantly higher than that of initiation and termination reactions. This means that between the two "critical" steps of initiation and termination, there are numerous propagation steps, which only consume monomers. Notably, monomers are the most abundant species in the simulation system. During this period, the changes in the parameter ∑ 𝑁 𝑎 𝑖 of the exponential distribution are minimal. Additionally, the active radicals in the system only undergo propagation.