THE CONDITION OF GELATION FOR THREE DIMENSIONAL POLYCONDENSATION AND COPOLYCONDENSATION REACTIONS
三向缩聚及共缩聚反应的胶凝化条件

A simple and general method for evaluating the condition of gelation for three dimensional polycondensation and copolycondensation reactions is presented. By reasonable development of Flory's method, the author suggested a new concept for the critical condition of gelation, namely, that the probability for a central branch point to be connected to themselves attains unity. According to this concept without referring to the molecular size distribution function, equations for the gel point for various generalized reaction types were obtained,which include almost all types of reactions encountered in practce. The results previously obtained by other authors appear as special cases of this paper.