Composition of Random Terpolymers

Synthesis of terpolymers has increased in commercial significance over the past few decades. Consider three monomer repeat units entering a polymer backbone chain in a CSTR. There are nine propagation reactions now  

The free radical species formed may be assnmed to be highly reactive and can be assnmed to be consnmed as rapidly as formed. This is referred to as the qnasi-steady-state assnmption, QSSA. Thns, 

Combining Equation (10.15) and the results from QSSA given by Equations (10.19-10.21), it can be seen that 

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