Abstract: By means of the theory of polycondensation reaction of A_a-B_btype involving intra-molecular cyclization proposed by Tang Au-chin et al, the poiycondensation reaction of hexanedioic acid-trimethylol propane with stoichiometric ratio 1. 3 is analyzed. The theoretical sol-gel distribution curve is in accordance with the experimental results. Furthermore, the contribution of intramolecular cyclization to the gel point is estimated. For post-gel, the number-, weight-and Z-average molecular weights are evaluated.

Key words: Sol-gel distribution, Poly condensation probability, Intramolecular cyclization conversion, Number-, weight-and Z-average molecular weights