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by

where is the extent of the reaction and is the average functionality of reaction mixture. For the gel can be considered to be infinite, thus the critical extent of the reaction at the gel point is found as

If is greater or equal to , gelation occurs.

Flory Stockmayer approach

Flory and Stockmayer used a statistical approach to derive an expression to predict the gel point by calculating when approaches infinite size. The statistical approach assumes that (1) the reactivity of the functional groups

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