Tong Shuixin
1989
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Journal
Acta Polymerica Sinica
Abstract
N-ethylacrylamide (NEA),N-n-propylacrylamide(NNPA),N-iso-propylacrylamide (NI-PA), piperidylacrylamide(PRA),N,N-diethylacry/lamide(NDEA)(and N,N-dimethylacrylamide (NDMA) monomers and the hydrogels of their copolymers with N,N'-methylene-bis-acrylami-de (BiS) have been synthesized. It was found that PNEEA, PNNPA, PNIPA, PPRA and PNDEA hydrogels undergo a discontinuous phase transition during, temperature variation. The effects of monomeric structures, composition of the starting monomeric mixture and the polymerization temperature on the formation, structural heterogeniety and swelling characteristics of the hydrogels have been systematically studied. The relative reactivities of Bis and NIPA and the cause of the structural heterogeneity were proposed.