Chemical Science, Journal Year: 2024, Volume and Issue: 15(48), P. 20388 - 20396
Published: Jan. 1, 2024
ZnTPPC6Br was synthesized as a photocatalyst and initiator for photoATRP, yielding fructose-based glycopolymeric photosensitizers targeted PDT, which showed enhanced efficacy against MCF-7 cells cancer treatment.
Language: Английский
Nature Reviews Methods Primers, Journal Year: 2025, Volume and Issue: 5(1)
Published: Jan. 9, 2025
Language: Английский
Citations
3
European Polymer Journal, Journal Year: 2024, Volume and Issue: 220, P. 113429 - 113429
Published: Sept. 2, 2024
Despite significant advancements in thermal and photothermal depolymerizations, the success of these techniques relies on tedious deoxygenation procedures. Herein, we report development depolymerization technique efficient without prior deoxygenation, which was enabled by copper/ligand complexes inclusion (0.25 wt% relative to solvent) zinc oxide (ZnO) nanocrystals activated UV light. This approach tested for poly(methyl methacrylate) (PMMA) prepared atom transfer radical polymerization (ATRP); effects solvent polarity activity ligands were investigated. Unexpectedly, a low-activity Cu-complex with 2,2'-bipyridyne ligand, combination low-polarity solvent, 1,2,4-trichlorobenzene, relatively high yields less than 1 h at 150 °C. Higher ATRP tris(2-pyridylmethyl)amine (TPMA) N,N,N',N'',N''-pentamethyldiethylenetriamine (PMDETA) ligands, efficient, associated their decomposition and/or excessive formation radicals premature termination chain ends. The presented facile designed be used even partially aerated reactors, opening new avenues depolymerization.
Language: Английский
Citations
4
Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown
Published: April 2, 2025
Multidentate amines have been widely used as ligands (L) for Cu-catalysts in atom transfer radical polymerization (ATRP) and electron donors photochemically induced polymerizations. However, mechanistic aspects of the role ATRP dark remained elusive. Herein, structure-activity relationship related reactions with Br-CuII/L complexes and/or alkyl bromides (R-Br) were investigated 25 amines. Amines function reducing agents via an outer sphere (OSET) mechanism, enabling slow but continuous generation CuI/L activators inducing controlled ATRP. two amines, diazabicyclo(5.4.0)undec-7-ene (DBU) 1,1,3,3-tetramethylguanidine (TMG), reduced faster, suggesting inner (ISET) process. ATRP, starting initial deactivators (Br-CuII/L) species, proceeded presence excess tertiary such tris[2-(dimethylamino)ethyl]amine (Me6TREN), 1,4-diazabicyclo[2.2.2]octane (DABCO), TMG at room temperature afforded polymers low dispersities (Đ ≤ 1.15). With copper(II) triflate complex (CuII/L+2, -(OTf)2), which has a more positive reduction potential, several inexpensive secondary including triethylamine (TEA) dimethylethanolamine (DMAE). Interestingly, multidentate also served direct R-Br elevated temperatures (60 °C). In all cases, chains initiated not by amine cations byproducts transfer. enabled residual air flasks large headspace, underpinning them robust accessible agent practical applications.
Language: Английский
Citations
0
Macromolecules, Journal Year: 2025, Volume and Issue: 58(5), P. 2210 - 2223
Published: Feb. 18, 2025
Polymeric materials have become indispensable due to their versatility and low cost, yet environmental impact presents a significant global challenge. Traditional chemical recycling methods typically rely on heat as stimulus; for instance, pyrolysis is popular methodology which faces limitations high energy consumption, product selectivity, the generation of undesirable byproducts. In response, recent advances in promotion depolymerization degradation through alternative stimuli such light, electrochemistry, mechanical force, shown promising potential more efficient selective polymer breakdown, yielding either starting monomers or valuable small molecules. This perspective explores key examples these emerging strategies, highlighting improve upon current protocols offer pathways under milder conditions, while identifying challenges that future research must address translate chemistry into viable broadly applicable strategies.
Language: Английский
Citations
0
Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 22, 2025
Abstract Although the chemical recycling of polymers synthesized by controlled radical polymerization enables recovery pristine monomer at low temperatures, it operates efficiently under strictly anaerobic conditions. Instead, oxygen‐tolerant depolymerizations are scarce, and either restricted to use a boiling co‐solvent or performed in closed vessels, often suffering from conversions. Here, an open‐vessel, depolymerization atom transfer (ATRP)‐synthesized is introduced, leading high percentages regeneration (>90% efficiency). Dissolved oxygen eliminated utilizing catalyst loadings, lower loadings combined with initiator. Notably, methodology compatible various solvents (i.e., anisole, 1,2,4‐trichlorobenzene (TCB), 1,2‐dichlorobenzene (DCB), etc.) range commercially available ligands including tris 2‐(dimethylamino)ethylamine (Me 6 TREN) tris(2‐pyridylmethyl)amine (TPMA), as well more inexpensive alternatives such tris(2‐aminoethyl)amine (TREN) N,N,N‘,N‘‘,N‘‘ ‐pentamethyldiethylenetriamine (PMDETA).
Language: Английский
Citations
0
Chinese Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 24, 2025
Language: Английский
Citations
0
Chemical Science, Journal Year: 2024, Volume and Issue: 15(48), P. 20388 - 20396
Published: Jan. 1, 2024
ZnTPPC6Br was synthesized as a photocatalyst and initiator for photoATRP, yielding fructose-based glycopolymeric photosensitizers targeted PDT, which showed enhanced efficacy against MCF-7 cells cancer treatment.
Language: Английский
Citations
1