As you know, acrylamide has the structural formula H2C=CH-CO-NH2 and can be polymerized in a facile manner. The closest to this compound is methacrylamide with the structural formula H2C=C(CH3)-CO-NH2. If you like to try polymerizing N-substituted acrylamides such as N-methylacrylamide H2C=CH-CO-N(H)(CH3), then it is fine but you will find that N,N-disubstitued acryalamides (e,g. H2C=CH-CO-N(CH3)2 ) are easier to polymerize free radically with high polymeric yield.
My suggestions come from "some" experience with the compounds that are mentioned above.
In addition to what is suggested by Mr. Nizar Matar, I'd like to suggest to use 2-Acrylamido-2-methylpropane sulfonic acid (AMPS), which is a reactive, hydrophilic, sulfonic acid acrylic monomer.