The Flory‐Wall expressions for the fraction of substituents remaining on a vinyl copolymer, when substituents are removed at random from adjacent 1,3 positions, are extended to the case of nonrandom copolymerization. A copolymer composition equation is derived for the case in which the type of monomer preceding the active freeradical chain end affects the propagation reaction. The distribution of lengths of sequences in copolymers is discussed.
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