0)] Initiator diradical without undecomposed peroxide groups generated by total decomposition.
2)] Monomer diradical with two undecomposed peroxide groups.
0)] Monomer diradical without undecomposed peroxide groups.
i)] PS diradical of chain length n containing i undecomposed peroxide groups.
n] Stoichiometric coefficient corresponding to a PS diradical of chain length n generated by total decomposition of a polymer with undecomposed peroxide groups.
Note the following: (i) when two monoradicals with i and j undecomposed peroxide groups terminate, the formed polymer will contain i+j undecomposed peroxide groups; (ii) diradicals only have an even number of peroxide groups, as they are generated only by propagation of the initiator diradical (with only two peroxide groups), and by combination termination of other diradicals, all of which have an even number of peroxide groups or no peroxide groups; (iii) due to assumption (c), polymeric chains may suffer both sequential decomposition reactions or total decompositions reactions.
Polymers with two undecomposed peroxide groups have higher concentration than polymers with a higher number of undecomposed peroxide groups, because these are the main products of an initiator diradical (1) that propagated and terminated to form a polymeric chain.
The Basic Module of Appendix A allows the prediction of global chemical species' evolution along the reaction (total mono- and diradicals, total polymer).