Kinetic Analysis of A 2 + AB 2 Polymerization Approach

The kinetic model of the co‐polycondensation with A 2 and AB 2 type monomers is developed and the analytical expressions of the various molecular parameters of the products are derived rigorously. The monomer feed ratio ( α ) of A 2 to AB 2 significantly affects the molecular parameters and the critical condition of gelation. Gelation can be avoided if α is > $1 + \sqrt {3} /2$ . At the critical state, the degree of branching decreases firstly and reaches its minimum value at about α≈0.22. Then, it increases with increasing α ‐value. In comparison with experimental results, non‐equal reactivity of the active groups should be considered.