One Group of Divinyl Monomer Having Lower Reactivity

One Group of Divinyl Monomer Having Lower Reactivity 

Let p be the fraction of A and B which have polymerized, and r be the reactivity ratio between C and B groups (r = ac/ Ab)- At conversion p ( Pc) the concentrations of unreacted A and B have been reduced to [a]o(1 — p) and [B]o(1 — p), respectively, while the concentration of unreacted C groups is still essentially [C]q. During a small increase in p, given by dp, the following changes in concentrations of A, B, and C groups will occur  

The fraction of C groups which are reacted at the conversion p is therefore 

When this reaches the critical value of (with DP replaced by DPy,), gelation occurs  

Pc = 1 - exp[-l/(2r/YzDP ,)] Thus gelation is delayed for a lower value of r. 

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