Abstract
Anionic polymerization of acrylamide (AcAm) was initiated with the disodium salt of polye(thylene oxide) (PEO) in several solvents at various temperatures, and the products were analyzed by 1H and 13C NMR spectroscopies. The Michael type addition of alkoxide anion of PEO to AcAm monomer did not occur in the initiation reaction. Polymerization proceeded exclusively via a hydrogen-transfer mechanism. The polymerization at a relatively low temperature in a polar solvent resulted in the formation of long- and short-chain branchings at the nitrogen atom in amide group and the poly-β-alanine (PBA) structure. Free rotation of CO–N bond at the branching point was observed by high-temperature NMR measurement. In the polymerization at higher temperature in a non-polar solvent, the branching structure was greatly reduced and almost linear PBA was obtained.
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This idea was suggested by the reviewers. The authors gratefully acknowledge them.
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Murakami, Y., Suzuki, T. & Takegami, Y. Anionic Polymerization of Acrylamide Initiated with the Disodium Salt of Poly(ethylene oxide). Polym J 17, 855–861 (1985). https://doi.org/10.1295/polymj.17.855
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DOI: https://doi.org/10.1295/polymj.17.855