Experimentally Observed Gel Points in Polyfunctional Condensations

Additional ingredients, diethylene glycol and r == COOH p at gel point O obs. at gel point 

The results of the experiment depicted in Fig. 62 and others similarly obtained are summarized in Table XXXI. In every case the observed gel point is reached at higher than the theoretical extent of reaction. The discrepancies between the observed and calculated ojc s appear to be due to the failure of the theory to take into account a minor degree of intramolecular condensation. Since some of the interunit linkages 

The identification of the gel point with the stage in the polymerization at which infinite networks make their appearance is confirmed by the results cited, and the extension of the assumption of random reaction to polyfunctional systems appears to be warranted. 

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