Phenyltrialkylborates as co-initiators with cyanine dyes in visible light polymerization of acrylates

Jędrzejewska, Beata; Pietrzak, Marek; Rafiński, Zbigniew

doi:10.1016/j.polymer.2011.03.035

Cited by 21 publications

(20 citation statements)

References 34 publications

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“…Essentially, one can test a possibility of the application of the Marcus theory for the prediction of the photoinitiated polymerization rate by (1) the use of one electron acceptor and a series of electron donors and (2) the use of a series of dyes and only one type of electron donor. The first method usually yields free radicals with different reactivities, [5, 6] and this might have an impact on the final rate of photoinitiated polymerization. The use of the photoredox pairs under the study represents the first method.…”

Section: Introductionmentioning

confidence: 99%

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Factors affecting the TMPTA radical polymerization photoinitiated by phenyltrialkylborates paired with tri-cationic hemicyanine dye. Kinetic studies

Jędrzejewska

2013

Colloid Polym Sci

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This article introduces tri-cationic hemicyanine dye employed as a visible-light photoinitiator of acrylic monomers polymerization. This dye, in combination with borate anions, was found to be a very effective photoinitiating system. The kinetics of trimethylolpropane triacrylate polymerization was studied by a microcalorimetric method. The photoredox pair concentration, the co-initiator structure as well as the light intensity strongly affected the progress of the polymerization, leading, for example, to an increase in the polymerization rate and quantum yield of the process. The efficiency of these photoinitiators was discussed on the basis of the free energy change for electron transfer from a borate anion to an excited hemicyanine dye cation. The ∆Gel values were estimated for photoredox pairs containing a series of phenyltrialkylborate anions and one styrylpyridinium dye cation. The relationship between the rate of polymerization and the free energy of activation for electron transfer reaction gives the dependence predicted by the classical theory of electron transfer. The photoinitiating abilities of the selected novel photoredox pairs (BPB61, BPB7, BPB8, and BPB9) are comparable with the photoinitiating efficiency of commercially available photoinitiators.

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Section: Introductionmentioning

confidence: 99%

“…The use of the photoredox pairs under the study represents the first method. Besides the thermodynamics of the electron-transfer process, one should take into account the fact that the photoinitiation ability of the donor–acceptor pairs depend on the nature of the reacting partners [2, 6]. …”

Section: Introductionmentioning

confidence: 99%

Factors affecting the TMPTA radical polymerization photoinitiated by phenyltrialkylborates paired with tri-cationic hemicyanine dye. Kinetic studies

Jędrzejewska

2013

Colloid Polym Sci

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“…Therefore, in the past decade, much effort has been invested in the design of visible-light-sensitive borate salts [3][4][5]. There is one major strategy that makes it possible to extend the spectral sensitivity of these salts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, properties, and application of new benzothiazole‐based sensitisers in polymer chemistry

Kabatc

Jurek

2015

Coloration Technology

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New photoinitiating systems composed of benzothiazolestyrylium dyes as chromophores and nbutyltriphenylborate anion as electron donor were prepared and characterised. Photoredox pairs consisting of hemicyanine dyes and organoborate salts may act as visible-light photoinitiators for the radical polymerisation of multifunctional acrylates. The efficiences of these photoinitiator systems are based on the free energy changes of an electron transfer from borate salt to the dye. Experimental results show that the photoinitiating ability of the photoredox pair tested strongly depends upon the reduction potential of hemicyanine dye, the oxidation potential of borate salt, and the structure of the dicationic dye.

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“…The most commonly employed photoinitiators are those that form radicals by reactions of excited states with an appropriate coinitiator. It has also been proposed that the efficiency of these photoinitiator systems can be improved by the addition of arylborane as a second initiator agent .…”

Section: Introductionmentioning

confidence: 99%

Photochemistry of Tetraphenyldiboroxane and its Use as Photopolymerization Coinitiator,

Santos

Cavalheiro

Neumann

2013

Photochem & Photobiology

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2-Hydroxyethyl methacrylate (HEMA) was photopolymerized in the presence of Safranine (SfH(+)) and tetraphenyldiboroxane (TPhB). Polymerization results are correlated with the photochemistry of TPhB and its ability to aggregate forming hydrophobic domains (critical aggregation concentration, cac, 1.2 × 10(-4) M). Polymerization was not observed when the TPhB concentration was below the cac, indicating that the polymerization is initiated in the hydrophobic environment. The quenching of the triplet state of SfH(+) by TPhB and the generation of the semireduced species of SfH(+) suggests an electron transfer from the boron compound to the excited dye, and that the resulting boron-centered radical initiates the polymerization process.

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Phenyltrialkylborates as co-initiators with cyanine dyes in visible light polymerization of acrylates

Cited by 21 publications

References 34 publications

Factors affecting the TMPTA radical polymerization photoinitiated by phenyltrialkylborates paired with tri-cationic hemicyanine dye. Kinetic studies

Factors affecting the TMPTA radical polymerization photoinitiated by phenyltrialkylborates paired with tri-cationic hemicyanine dye. Kinetic studies

Synthesis, properties, and application of new benzothiazole‐based sensitisers in polymer chemistry

Photochemistry of Tetraphenyldiboroxane and its Use as Photopolymerization Coinitiator,

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