Photopolymerization of Methyl Methacrylate Sensitized by Tris(2,2′-bipyridine)iron(III)

Goswami, Aradhana; Baruah, Sanjib

doi:10.1002/(sici)1097-0126(199705)43:1<22::aid-pi744>3.0.co;2-7

Cited by 9 publications

(1 citation statement)

References 5 publications

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“…In parallel, several photoinitiator systems believed to generate the anion radical of the vinyl monomer as an initiator of the polymerization have been reported. These systems employ polyaromatic hydrocarbon compounds 8 -11 or transition-metal complexes 4,[12][13][14][15] as chromophores and an aliphatic amine as a coinitiator. Note that in these photoinitiator systems, the active species are generated bimolecularly and therefore, relatively coinitiator large concentrations are generally required.…”

Section: Introductionmentioning

confidence: 99%

Tetraalkylammonium salt as photoinitiator of vinyl polymerization in organic and aqueous media: A mechanistic and laser flash photolysis study

Gómez

Palacios

Previtali

et al. 2002

J. Polym. Sci. A Polym. Chem.

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ethyl]-N-(1-methylnaphthyl)ammonium tetrafluoroborate (I) was synthesized with the aim of obtaining a versatile photoinitiator for vinyl polymerization in organic solvents and water. Salt I was able to trigger the polymerization of acrylamide, 2-hydroxyethylmethacrylate and styrene even at very low concentrations of the salt (ϳ1.0 ϫ 10 Ϫ5 M). Using laser flash photolysis and fluorescence techniques and analyzing the photoproduct distribution, we were able to postulate a mechanism for the photodecomposition of the salt. With irradiation, I undergoes an intramolecular electron-transfer reaction to form a radical ion pair (RIP). The RIP intermediate decomposes into free radicals. The RIP and the free radicals are active species for initiating the polymerization. Depending on the concentration of the vinyl monomers studied, the initiation mechanism of the polymerization reaction changes. At large monomer concentrations, the RIP state is postulated to trigger the reaction by generating the anion radical of the olefin substrate. At a low monomer concentration, the free radicals produced by the decomposition of I are believed to start the chain reaction.

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Section: Introductionmentioning

confidence: 99%

Tetraalkylammonium salt as photoinitiator of vinyl polymerization in organic and aqueous media: A mechanistic and laser flash photolysis study

Gómez

Palacios

Previtali

et al. 2002

J. Polym. Sci. A Polym. Chem.

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Thioxanthone‐Based Hydrophilic Visible Photoinitiators for Radical Polymerization

Xiong

Yang

et al. 2016

Macro Chemistry & Physics

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Three thioxanthone‐based hydrophilic visible photoinitiators (TX‐MPEG350, TX‐MPEG550, and TX‐MPEG750) are prepared and characterized. All of them exhibit excellent water dispersion properties. Real‐time FTIR investigation shows that they can be used as visible photoinitiators for radical polymerization in waterborne systems in the presence and absence of the hydrogen donors. Among them, TX‐MPEG550 has been illustrated as the best hydrophilic visible photoinitiator in the presence of hydrogen donors and would have great potential applications in waterborne visible photocuring systems after carefully investigating the photopolymerization behavior of TX‐MPEGs in different conditions.

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Polymerization of acrylamide photoinitiated by tris(2,2′‐bipyridine)ruthenium(II)–amine in aqueous solution: Effect of the amine structure

Rivarola

Bertolotti

Previtali

2001

J. Polym. Sci. A Polym. Chem.

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The photopolymerization of acrylamide (AA) initiated by the metallic complex tris(2,2Ј-bipyridine)ruthenium(II) [Ru(bpy) 3 ϩ2 ] in the presence of aliphatic and aromatic amines as co-initiators was investigated in aqueous solution. Aromatic amines, which are good quenchers of the emission of the metal-to-ligand-charge-transfer excited state of the complex, are more effective co-initiators than those that do not quench the luminescence of Ru(bpy) 3 ϩ2 , such as aliphatic amines and aniline. Laserflash photolysis experiments show the presence of the reduced form of the complex, Ru(bpy) 3 ϩ1 , for all the amines investigated. For aliphatic amines, the yield of Ru(bpy) 3 ϩ1 increases with temperature, and on the basis of these experiments, a metal-centered excited state is proposed as the reactive intermediate in the reaction with these amines. The decay of the transient Ru(bpy) 3 ϩ1 is faster in the presence of AA. This may be understood by an electron-transfer process from Ru(bpy) 3 ϩ1 to AA, regenerating Ru(bpy) 3 ϩ2 and producing the radical anion of AA. It is proposed that this radical anion protonates in a fast process to give the neutral AA radical, initiating in this way the polymerization chain.

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Photopolymerization of Methyl Methacrylate Sensitized by Tris(2,2′-bipyridine)iron(III)

Cited by 9 publications

References 5 publications

Tetraalkylammonium salt as photoinitiator of vinyl polymerization in organic and aqueous media: A mechanistic and laser flash photolysis study

Tetraalkylammonium salt as photoinitiator of vinyl polymerization in organic and aqueous media: A mechanistic and laser flash photolysis study

Thioxanthone‐Based Hydrophilic Visible Photoinitiators for Radical Polymerization

Polymerization of acrylamide photoinitiated by tris(2,2′‐bipyridine)ruthenium(II)–amine in aqueous solution: Effect of the amine structure

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