Fig. 2. (a) 1H-NMR spectra of the NIPAM/p-Ti3C2Tx mixture (before N2 purging) and NC hydrogel (after N2 purging and polymerization). (b) Typical 1H-NMR spectra of the different polymers initiated by p-Ti3C2Tx. PAAm: poly(acrylamide); PMMA: poly(methyl methacrylate); PHEMA: poly(hydroxyethyl methacrylate); PDMA: poly(N,N-dimethylacrylamide); solvent, DMSO-d6. The arrows denote the proton signals in the polymer backbone. The shaded areas denote the proton signals in the monomeric double bonds. (c) 1H-NMR spectra of PNIPAM initiated by p-Ti3C2Tx and (d) conversion of NIPAM to its polymer at different reaction times. All samples were polymerized using a 1.0 wt% NIPAM monomer concentration and 0.35 mg mL–1 Ti3C2Tx nanosheet concentration.
