Thiol-ene click synthesis of adsorption functionalized poly(ionic liquid)s: influence of the mole fraction of pendant enes

Adsorption functionalized poly(ionic liquid)s could be thiol-ene click synthesized within surfactant-free ionic liquid microemulsions. However, the influence of the mole fraction of pendant enes on the as-prepared polymer is still unclear. Herein, the influence of the mole fraction of pendant enes on the molecular structure, surface morphology, thermostability and adsorption performance of poly(ionic liquid)s were investigated in detail. To characterize the as-prepared polymers, FTIR, NMR, TGA, DSC, SEM and UV–vis were used, and the adsorption isotherm/kinetics studies were carried out. The results showed that the mole fraction of pendant enes had a significant difference on the characterization of poly(ionic liquid)s. The lower mole fraction of pendant enes donated lower T10% value, slower degradation rates and lower Tg, and the value of 0.30 was the boundary of forming structure with various beading sizes and structure with various irregularly shaped apertures. In addition, poly(ionic liquid)s with different mole fraction of pendant enes all showed excellent adsorption performance to DR, which indicated remarkable potential in the application of dying wastewater treatment.