a new composition of matter comprising an acrylamide or methacrylamide monomer characterized by the following structural formula : ## str1 ## wherein r 1 and r 2 are hydrogen or methyl ; r 3 , r 4 , r 5 , r 6 and r 7 are lower alkyls ; n is an integer ranging from 1 to 6 ; and x and y are the same or different anions .