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The pyrolysis of N‐(α‐methoxyethyl) acetamide, which was obtained by one‐step reaction of acetamide, acetaldehyde, and methanol, gave N‐vinylacetamide (NVA) in a good yield. The polymerizability and copolymerizability of NVA were studied. Free radical polymerization was carried out in the presence of radical initiator or by γ‐ray irradiation. The monomer reactivity ratios of NVA were estimated in the copolymerization with acrylamide, vinyl acetate, and methyl methacrylate. The solvents were found to influence the monomer reactivity ratio. NVA showed a typical copolymerizability as nonconjugated vinyl monomer, and Q and e values were obtained in DMF as 0.16 and −1.57, respectively.

SYNOPSISPoly (N-vinylacetamide ) ( polyNVA) hydrogels were prepared by the copolymerization of N-vinylacetamide (NVA) with divinyl compounds such as methylene-bis-acrylamide, methylene-bis-NVA, and butylene-bis-NVA in a high yield. The resulting hydrogels were more stable than polyacrylamide gel and showed quite a high swelling property in a wide range of pH ( 1-12) and even in a 5 M NaCl solution. They showed not only typical characteristics nonionic hydrogels, but also an amphiphilic property and they swelled well in some organic solvents. When the gels were partially hydrolyzed, cationic hydrogels, i.e., crosslinked poly ( NVA-co-vinylamine) , were collected. The resulting superabsorbent hydrogels absorbed 400 times of water. 0 1993 John Wiley & Sons, Inc. Keywords: N-vinylacetamide hydrogel crosslinked polymer free radical polymerization poly (vinylamine )