Mayo–Lewis equation

The Mayo–Lewis equation or copolymer equation in polymer chemistry describes the distribution of monomers in a copolymer: It is named for Frank R. Mayo and Frederick M. Lewis.

Taking into consideration a monomer mix of two components ${\displaystyle M_{1}\,}$ and ${\displaystyle M_{2}\,}$ and the four different reactions that can take place at the reactive chain end terminating in either monomer (${\displaystyle M^{*}\,}$) with their reaction rate constants ${\displaystyle k\,}$:

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