Diaryliodonium salts facilitate metal-free mechanoredox free radical polymerizations

Abstract

Mechanically-induced redox processes offer a promising alternative to more conventional thermal and photochemical synthetic methods. For macromolecule synthesis, current methods utilize sensitive transition metal additives and suffer from background reactivity....

CdS nanocages@defective-CoNi-LDH with bilayer porous hollow frameworks toward optimized sono-photocatalytic performance

“…S24†), implying that it is surface defects rather than increases in surface area that promote catalysis. 42,43 Similar results were observed for the current–voltage curves (Fig. 5d), in which the decrease in the onset potential, as well as the increase in the current density, confirmed that HD-CoNi-LDH plays an important role in charge transfer.…”

Mechanoredox Catalysis Enables a Sustainable and Versatile Reversible Addition‐Fragmentation Chain Transfer Polymerization Process

“…Mechanoredox RAFT polymerizations were carried out using DPIHP as the initiator and 2‐(dodecylthiocarbonothioylthio)‐2‐methylpropionic acid (DDMAT) as the chain transfer agent. Because of our prior success with BaTiO 3 in FRP, [31] BaTiO 3 was used as the PNP in all mechanoredox RAFT studies.…”

“…Recently, piezoelectric nanoparticles (PNPs) such as ZnO and BaTiO 3 have been utilized to initiate small molecule arylation, borylation, atom‐transfer radical addition, and trifluoromethylation reactions under ball milling (BM) conditions [25–27] . In addition to small molecule transformations, mechanoredox catalysis is utilized in polymer science to facilitate step growth, free radical polymerization (FRP), and atom transfer radical polymerization (ATRP) under ultrasonic (US) irradiation [14, 28–32] . Similar chemistry within related thermosets provides preliminary evidence for utilizing mechanoredox catalysis in force‐responsive living“ materials [33] …”

Sonochemistry-assisted photocontrolled atom transfer radical polymerization enabled by manganese carbonyl

“…4–6 RDRPs modulated by external stimuli have received intense attention because they are capable of providing spatiotemporal control over polymerization, decreasing energy demands and avoiding side reactions. 7–18…”

“…[4][5][6] RDRPs modulated by external stimuli have received intense attention because they are capable of providing spatiotemporal control over polymerization, decreasing energy demands and avoiding side reactions. [7][8][9][10][11][12][13][14][15][16][17][18] Photocatalytic approaches have been developed to convert light into chemically reactive species that mediate the controlled synthesis of well-defined polymers. [19][20][21] One possibility for conducting photoinduced polymerizations is via the direct generation of activating radicals by the photoinduced cleavage of compounds, which can also mediate the deactivation and control the polymerization process.…”