Synthesis of a Highly Selective Scavenger of Precious Metals from a Printed Circuit Board Based on Cellulose Filter Paper Functionalized with a Grafted Polymer Chain Bearing <i>N</i>-Methyl-2-hydroxyethylcarbamothioate Moieties

Hyder, Mansoor; Ochiai, Bungo

doi:10.1021/acsomega.1c06988

Cited by 2 publications

(2 citation statements)

References 57 publications

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“…The fields of application concerned are immense and diverse and depend on the type of sought properties and therefore on the type of functional entities attached at the surface of the material. 6−8 They encompass medical and public health field, 9−12 antifouling coatings in the marine environment, 13 self-cleaning day-life textiles, 14 treatment of drinking water, 15 recovery of rare metals from wastewater, 16 friction control, 17 organic electronics, 18 and supported catalysis. 19 Many methods of surface functionalization have already been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Often, functionalization with a monolayer is not sufficient to give the material the desired property, hence the need to use a layer of polymers to obtain sufficient thickness. The fields of application concerned are immense and diverse and depend on the type of sought properties and therefore on the type of functional entities attached at the surface of the material. − They encompass medical and public health field, − antifouling coatings in the marine environment, self-cleaning day-life textiles, treatment of drinking water, recovery of rare metals from wastewater, friction control, organic electronics, and supported catalysis …”

Section: Introductionmentioning

confidence: 99%

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Direct Quantitative Characterization of Polymer Brushes Obtained by Surface-Initiated ATRP on Silicon

Gouget-Laemmel

Zidelmal

Soares

et al. 2022

ACS Appl. Polym. Mater.

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With respect to the increasing need for fully characterizing surface-tethered polymer brushes, the capacity of quantitative IR-Fourier transform infrared (FTIR) spectroscopy using a multiple-internal-reflection Si prism as the attenuated total reflection (ATR) element is investigated to directly characterize the surface chemical modifications occurring during a surface-initiated controlled polymerization. A simple two-step strategy is used involving first the covalent grafting of atom transfer radical polymerization (ATRP) initiators on a hydrogenated silicon surface and the subsequent polymerization of styrene. Three prefunctionalized surfaces designated Si-Br1, Si-Br2, and Si-Br3 are obtained by different procedures. The initiator grafting densities obtained by quantitative IR are 1.7 ± 0.3 nm–2 for Si-Br1, 1.5 ± 0.3 nm–2 for Si-Br2, and 0.9 ± 0.2 nm–2 for Si-Br3. After the polymerization of styrene under the same experimental conditions (grafting from without sacrificial initiators) and a careful Soxhlet rinse to remove physisorbed polymers formed in solution, almost no polymerization is observed using Si-Br1 with a value of the density in polymerized styrene units of 12 ± 2 nm–2, which is probably due to the chelating effect of the amino linkers used for grafting the initiators in Si-Br1. In contrast, the densities in styrene units are 54 ± 11 nm–2 using Si-Br2 and 141 ± 28 nm–2 using Si-Br3. The degree of polymerization (DP) has been evaluated by measuring the polymer thickness (by ellipsometry and atomic force microscopy, AFM) and using a scaling law relating the latter to DP for dry polymer brushes. High DP values of 200 and 1000 are found in the case of Si-Br2 and Si-Br3, respectively. The fraction of active polymerization initiators is found to be 15–18%, independent of the initiator surface density. In contrast, polymerization kinetics appear affected by steric hindrance and conformational disorder among grafted initiators. This approach for determining surface densities of grafted initiators and grafted polymer chains and DPs is fully generalizable to any other polymer system.

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