Camphorquinone–amines photoinitating systems for the initiation of free radical polymerization

Jakubiak, Julita; Allonas, Xavier; Fouassier, Jean‐Pierre; Sionkowska, Alina; Andrzejewska, Ewa; Lindén, Lars‐Åke; Rabek, Jan F.

doi:10.1016/s0032-3861(03)00568-8

Cited by 261 publications

(245 citation statements)

References 37 publications

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“…Photoinitiating systems based on camphorquinone (CQ) are the widely and most successfully used visible-light photoinitiators in dental restorative resins 1,2) . Although CQ is able to start the photopolymerization process by itself, the process will occur at a low rate 1) .…”

Section: Introductionmentioning

confidence: 99%

Can CQ Be Completely Replaced by Alternative Initiators in Dental Adhesives?

Ilie¹,

Hickel²

2008

Dental Materials Journal

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Despite good clinical acceptance, photoinitiating systems based on camphorquinone and amines raise concerns in terms of yellowing, aging, toxicity, or degradation in low pH conditions. This study aimed to prove whether CQ could be successfully replaced by alternative initiators in adhesive systems. Further, the efficiency of a prototype dual-wavelength LED (=Light Emitting Diode) curing unit was analyzed. In two commercial adhesive systems, CQ was completely replaced by Lucirin TPO. The commercial adhesives and their experimental counterparts were evaluated after curing for 10 seconds and 20 second with two dual-wavelength LED units and one regular LED unit, by applying the curing unit on the adhesive surface at two distances of 0 mm and 5 mm. Degree of cure and mechanical properties (Vickers hardness and modulus of elasticity) were assessed after 24-hour storage in distilled water at 37℃. Experimental data showed that the CQ-amine system could be completely replaced by Lucirin TPO when dual-wavelength LED unit was used for photoactivation.

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Section: Introductionmentioning

confidence: 99%

Can CQ Be Completely Replaced by Alternative Initiators in Dental Adhesives?

Ilie¹,

Hickel²

2008

Dental Materials Journal

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“…2a). This result was expected because DL-camphorquinone is usually used in combination with amines as a part of a photoinitiator system rather as a stand-alone photoinitiator [27]. Furthermore, when using HHEPMP as photoinitiator, good pattern definitions could be achieved at very low concentrations (0.1 % w/w) using low laser fluences (*29 mJ/cm 2 ) and moderate number of laser pulses ([40) (Fig.…”

Section: Resultsmentioning

confidence: 92%

Contactless Laser-Assisted Patterning of Surfaces for Bio-Adhesive Microarrays

Perez-Hernandez¹,

Paumer²,

Pompe³

et al. 2012

Biointerphases

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Micropatterned surfaces with cell adhesive areas, delimited by protein repellent microstructures, are in high demand for its potential use as relevant biological assays. This is not only because such surfaces allow directing cell growth in a spatially localized and restricted manner, but also because they can be used to elucidate basic cell growth and orientation mechanisms. Here, it is presented a laser-assisted micropatterning technique to fabricate large area microstructures of poly (ethylene glycol) hydrogel onto a cell adhesive surface: a biofunctional maleic anhydride copolymer. By varying photoinitiator, laser intensity, copolymer as well as the hydrogel layer thickness, the optimum conditions to produce high quality features were found. The suitability of these micropatterned substrates for bioassay applications was proved by cell adhesion studies. The introduced procedure could be used to prepare a broad range of microarrays for certain bioanalytical approaches and to create different types of biofunctional surfaces.

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“…In the presence of tertiary amines, it gives an effective photoinitiating system widely used for the crosslinking of methacrylate-based dental restorative polymers [30]. The addition of molecular oxygen to the excited triplet state of CQ forms 1,4-biradicals [31][32][33].…”

Section: Resultsmentioning

confidence: 99%

Metal-Free, Visible Light-Promoted Aerobic Aldehydes Oxidation

Hamami¹,

Vanoye²,

Fongarland³

et al. 2016

J Flow Chem

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An efficient and metal-free method for the oxidation of aldehydes to the corresponding carboxylic acids has been developed. In a simple continuous-flow photochemical reactor, the use of camphorquinone (CQ) irradiated with a white light-emitting diode (LED) source enhanced the autoxidation of aldehydes. Under 5 bar of oxygen, visible light, and 0.3 mol% of CQ, the rate of oxidation was increased from 6 times with 2-ethylhexanal to 30 times for n-nonanal. The large interfacial area generated by a segmented flow apparatus associated with radicals formed by photooxidation of CQ ensures metal-free high throughput of carboxylic acids under safe conditions.

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Camphorquinone–amines photoinitating systems for the initiation of free radical polymerization

Cited by 261 publications

References 37 publications

Can CQ Be Completely Replaced by Alternative Initiators in Dental Adhesives?

Can CQ Be Completely Replaced by Alternative Initiators in Dental Adhesives?

Contactless Laser-Assisted Patterning of Surfaces for Bio-Adhesive Microarrays

Metal-Free, Visible Light-Promoted Aerobic Aldehydes Oxidation

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