Abstract
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.
Highlights
Ionic liquids are attractive solvents that can boost clean technology development[1,2,3]
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
It can be detected that poly(ionic liquid)s which were more like white sponges were obtained with decreasing value of the mole fraction of pendant enes
Summary
Ionic liquids are attractive solvents that can boost clean technology development[1,2,3]. Covalent crosslinking through the photoinduced thiol-ene click reaction is a typical method to transform poly(ionic liquid)s into porous forms[16,17], and the particle size and morphology of as-prepared poly(ionic liquid)s significantly influence their adsorption performance toward dyeing wastewater. In 2017, Kloxin and coworkers prepared poly(ionic liquid)s via thiol-ene photopolymerization, and confirmed that the thiol–ene network charge and crosslink densities of poly(ionic liquid)s were controlled by varying the molar composition of the monomers in the formulation, the ene-functionalized monomers[18]. These ene-functionalized monomers included ionic liquid monomer and cross-linking agent. When increasing the content of ionic monomer, the crosslink density decreased, and so as the rubbery elastic modulus
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