Effect of monofunctional reactants on gel point in polycondensation reactions

Gel point prediction of metal‐filled castor oil‐based polyurethanes system

“…Flory and Stockmayer have defined the gel point as an extent of critical reaction and the conditions for the critical gel point have already been expressed [15,16,25,26], which shows that the gelation phenomenon in the present system is dependent on the polyol functionality. The conversion calculated by the above equation differs widely from the experimental conversion.…”

“…A similar trend was found at 40, 50, and 60°C. The gel point conversion for the unfilled system was calculated from the following relationship [25,26]:…”

Development of a quantitative theory of polycondensation

“…For example, an erroneous relationship was derived for the critical conversion during homopolycondensation of a polyfunctional monomer with two types of functional groups [210]. The effect of monofunctional reagents on the location of the gel point was treated incorrectly [213,214], as later pointed out [215]. Considering irreversible polycondensation in systems with several types of groups and calculating probability parameters entering in formulas which they derived using statistical method the authors [221] failed to interpret the integrals obtained from the solution of kinetic equations.…”