Sulfur containing poly(N‐isopropylacrylamide) copolymer hydrogels for thermosensitive extraction of gold(III) ions

Abstract

Poly[N‐isopropylacrylamide‐co‐[2‐(methylthio)ethyl methacrylate]], poly(NIPA‐co‐MTEMA) gels were prepared by free radical polymerization in aqueous solution. The homogeneous and heterogeneous gels were prepared by using 10 mM MTEMA in 5.0%(v/v) ethanol at 10°C and 30 mM MTEMA in 20%(v/v) ethanol at 50°C, in 1.0 and 1.5M NIPA solution, respectively. Homogeneous and heterogeneous gels had swelling ratios at 540 ± 28% and 551 ± 37%, respectively. The extraction of Au(III) ion was studied in batch method. The optimum pHs for the extraction of Au(III) by homogeneous and heterogeneous gels were 1–3 and 1–5, respectively. The suitable extraction time was 3 h at 50°C when using a rod‐shaped copolymer (0.7 cm diameter and 1 cm length). The adsorption behavior obeyed the Langmuir and Freundlich isotherms. The maximum sorption capacities of Au(III) onto homogeneous and heterogeneous gels were 62.8 and 322 μmol/g, respectively. The desorption equilibrium was reached within 2–3 h at 10°C by 0.1M thiourea in 5%(v/v) HCl. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

Synthesis of Poly(meth)acrylates with Thioether and Tertiary Sulfonium Groups by ARGET ATRP and Their Use as siRNA Delivery Agents

“…However, the exploration of sulfur as an heteroatom alternative to nitrogen in cationic polymers has been minimal. Thioethers, and their alkylated tertiary sulfonium species, have been produced for several applications including gold extraction, flocculants, biomedical materials, and functional substrates for polymer labeling. − To date, polymers containing thioether and tertiary sulfonium moieties have been prepared by ring-opening polymerization of N -carboxyanhydrides (NCA), reversible addition–fragmentation chain transfer (RAFT) polymerization, and free radical polymerization. ,− There has been one report on direct polymerization of the tertiary sulfonium species by RDRP and evaluation for siRNA delivery . Recent efforts to repurpose the phosphonium ion for siRNA delivery further validate this approach …”

Preparation of thermosensitive, calix[4]arene incorporated P(NIPAM‐co‐HBCalix) hydrogel as a reusable adsorbent of nickel(II) ions

“…Thus, 150 min shaking time was considered to be the optimum contact time for adsorption of metal ions on P(NIPAM-co-HBCalix) hydrogels. In particular, there are no chelating functional groups on the plain PNIPAM hydrogels, the adsorption of mental ions on PNIPAM hydrogels was low at 10 or 50 C. 33 This adsorption may be due to diffusion of metal ions into the matrix and weak interactions between metal ions and amide moieties of PNIPAM hydrogels. Therefore, this result means that introducing hexenyloxy groups to the calixarene platform is essential for creating a high extractability for Ni 21 ions.…”

Coordination of Noble Metals in Poly(vinyl mercaptoethanol) Particles Prepared by Precipitation/Emulsion Polymerization

“…[52][53][54] Interestingly, aqueous emulsion, precipitation, or dispersion polymerizations of thioether-containing vinyl monomers have so far scarcely been reported in literature, despite the industrial relevance of the processes and the convenient access to ready dispersions. [55,56] In particular, vinyl sulfides should enable access to polymers with high sulfur content by corresponding radical polymerization techniques, [57] but to the best of our knowledge no dispersion processes based on these monomers have been reported, yet. Keeping the potential in mind to create stable dispersions of sulfur-rich polymers in a straightforward and scalable process, we here aimed at establishing suitable conditions for the heterogeneous polymerization of vinyl mercaptoethanol (VME) as an industrially available S-vinyl monomer.…”