Quality Control of Cupric bromideIn 2019 ,《Pushing the Limit: Synthesis of SiO2-g-PMMA/PS Particle Brushes via ATRP with Very Low Concentration of Functionalized SiO2-Br Nanoparticles》 was published in Macromolecules (Washington, DC, United States). The article was written by Wang, Zongyu; Fantin, Marco; Sobieski, Julian; Wang, Zhenhua; Yan, Jiajun; Lee, Jaejun; Liu, Tong; Li, Sipei; Olszewski, Mateusz; Bockstaller, Michael R.; Matyjaszewski, Krzysztof. The article contains the following contents:
The kinetics and mechanism of the synthesis of SiO2-g-poly(Me methacrylate) (SiO2-g-PMMA) and SiO2-g-polystyrene (SiO2-g-PS) nanoparticles were investigated through studies conducted at very low concentrations of the ATRP initiator functionalized silica particles (SiO2-Br) in the presence of reducing agent (tin(II) 2-ethylhexanoate) and low ppm loadings of the CuII catalyst (25 ppm) complex. In the SiO2-g-PMMA system, the grafting d. decreased under very low concentrations (<100 ppm) of SiO2-Br. However, in the SiO2-g-PS system, the initiation efficiency, defined through the grafting d. of polymer chains on the particle surface, decreased significantly for lower concentrations of the initiator SiO2-Br. In addition, model systems with linear polymer chains (untethered) were studied to investigate the difference in initiation efficiency between polymers attached to nanoparticle surfaces and untethered chains. Because of the localization of initiating sites on the surface of nanoparticles and lower probabilities of collisions between nanoparticles, as compared to small initiator mols., particle brush systems exhibited less interparticle termination. This observation was employed to synthesize very high mol. weight (Mn> 500K) particle brushes with relatively narrow mol. weight distribution (Mw/Mn < 1.3).Cupric bromide(cas: 7789-45-9Quality Control of Cupric bromide) was used in this study.
Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Quality Control of Cupric bromide
Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”