A series of sequence-regulated vinyl copolymers with high-order and long vinyl monomer sequences were constructed via a combination of iterative single vinyl monomer additions, which were mediated by radical and cationic intermediates, and subsequent metal-catalyzed step-growth radical polymerization. The construction of vinyl monomer sequences was attained by iterative single monomer radical and cationic additions between a dichloride, having a similar substituent to that of vinyl monomers, and vinyl monomers such as styrenes, acrylates, and acrylonitrile. The resulting products were converted into sequenceregulated ab-type monomers that have embedded vinyl monomer sequences between an unconjugated CC bond and reactive C−Cl bond via selective allylation of one of the two C−Cl bonds at their terminals. The synthesized sequence-regulated ab-type monomers were polymerized via metal-catalyzed stepgrowth radical polymerization, which resulted in vinyl chloride units via repetitive intermolecular addition reactions between the CC and C−Cl terminals. Alternatively, aa-and bb-type sequence-regulated monomers, which have two unconjugated CC and two reactive C−Cl bonds, respectively, were prepared by similar iterative single monomer additions and were subsequently polymerized via metalcatalyzed step-growth radical polymerization. The repeating vinyl monomer sequence codes in the resulting polymers, such as ABCC, ABCD, ABBAC, ABDBAC, and ABDBACAEEAC, varied from 4 to 11 monomer units in which the embedded vinyl monomer units were styrenes, acrylates, acrylamides, acrylonitrile, vinyl chloride, vinylidene chloride, and ethylene.

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