In this paper, we studied the protonation of poly(N,N-dimethylaniline)
(PDMA) in two different acid media(sulfuric acid and trichloroacetic
acid), Using UV-Vis and H-1 NMR measurements, we found that PDMA could
present two types of protonated states, which depends on the acidity,
It can be concluded that protons were added on nitrogen atoms, of sub
stituent in the concentrated acid but on benzene ring of main chain in
the moderate acid solution.