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A Novel Method for Preparing Click-Ready Latex and Latex with Stability against High Electrolyte Concentrations
- Yang, Lei, Xu, Jianqing, Han, Jianli, Shen, Yifeng, Luo, Yingwu
- Industrial & Engineering Chemistry Research 2015 v.54 no.20 pp. 5536-5542
- coagulation, dithiothreitol, electrolytes, engineering, latex, methodology, moieties, nanoemulsions, polyacrylic acid, polymerization, sodium chloride, surfactants, thiols
- A novel method to synthesize click-ready latex based on reversible addition–fragmentation chain transfer (RAFT) miniemulsion polymerization is proposed. It involves the use of poly(acrylic acid)₃₀-b-poly((butyl acrylate)₂-co-(cyclohex-3-enylmethyl acrylate)₃) amphiphilic macro-RAFT agent as both the surfactant and polymerization mediator. It is demonstrated that the cyclohexenyl groups incorporated onto polymer chains are located on the surface of polymeric particles and remained unreacted during miniemulsion polymerization. These surface-rich cyclohexenyl groups allow highly efficient radical-mediated thiol–ene click (TEC) reactions with the water-soluble thiol compound dithiothreitol. The TEC reaction with thiol-terminated poly(N,N-dimethylacrylamide) (SH-PDMAAm) yielded particles with over one PDMAAm brushes per square nanometer. Such densely grafted brushes increased the particles’ critical coagulation concentration of sodium chloride by 1 order of magnitude, compared with particles without covalent-bonded PDMAAm.