Weight-average molar mass below the gel point

4 Weight-average molar mass below the gel point 

The weight-average number of monomers per polymer below the gel point is the average number of monomers in a polymer belonging to a randomly selected site. This number can be written as 1 for the site itself and T for each of the/ paths emanating from that site (Fig. 6.20)  

Diagram of the recurrence relation for the average number of monomers connected to site A through a given bond. 

The weight-average degree of polymerization diverges at the gel point, since the denominator of Eq. (6.59) is zero when p=Pc- Since the number-average degree of polymerization stays finite at p [Eq. (6.56)], the polydispersity index  

Random branching and gelation 6.4.5 Molar mass distribution 

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