Mariem Bouzrati -Zerelli

Université de Haute-Alsace | UHA · Institut de Science des Matériaux de Mulhouse : IS2M

Objective: The aim of our study is to develop amine-free photoinitiating systems (PISs) for the polymerization of representative dental methacrylate resins under blue light irradiation. PISs based on camphorquinone (CQ)/sulfinate and CQ/sulfonate, eventually in combination with an iodonium salt, are proposed and compared to the well-established CQ...

Diaryliodonium salts are well-established compounds in free radical chemistry and are already used as photoinitiators (free radical or cationic polymerization), but the presence of counter anions is a strong drawback. Indeed, a counter anion is always required (e.g., SbF6−) leading to potential toxicity issues or release of HF. In the present paper...

Iodonium sulfonates are proposed here as a new class of high‐performance coinitiators for camphorquinone (CQ)‐based systems for the polymerization of methacrylates under blue light irradiation. When combined with CQ, the new proposed coinitiators present excellent polymerization performances and are excellent candidates for the replacement of terti...

The present invention relates to a photocurable dental composition comprising a specific polymerization initiator system containing the combination of a photoinitiator compound and a coinitiator compound being a sulfinate compound or a sulfonate compound. The present invention also relates to the use of this polymerization initiator system in a pho...

Photoinitiators exhibiting an efficient thermally activated delayed fluorescence (TADF) are investigated. Known TADF metal complexes (copper-based structures) and purely organic molecules (carbazole/sulfone based organic structures) are used, for the first time, in the FRP of methacrylates, the CP of diepoxides and the synthesis of acrylate/diepoxi...

Dental composition comprising (a) a homogeneous phase comprising monomer combinations (i) and (ii), (i) and (iii), (ii) and (iii), or (i), (ii) and (iii), or comprising monomer (iii), wherein (i) represents one or more compounds having one or more radically polymerizable carbon-carbon double bonds; (ii) represents one or more compounds having one o...

Silyl glyoxylates are proposed here as a new class of high performance type I photoinitiators for free radical polymerization under air or in laminate (e.g., (meth)acrylates) upon exposure to different near-UV (at 395 nm; at 405 nm) and blue (at 477 nm) LEDs. The new proposed photoinitiators can also be used in the presence of additives that can en...

Two new near-UV and visible-light-sensitive photobase generators (PBGs) are synthesized and investigated. They are built on a near-UV and visible light sensitive (E)-3-(2,2′-bithiophen-5-yl)-2-cyanoacrylic acid chromophore and a latent strong base such as 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD). Upon i...

The present invention relates to a dental composition comprising a specific polymerization initiator system comprising a compound having an acylsilyl- or acylgermanyl-group. The present invention also relates the use of the compound having an acylsilyl- or acylgermanyl-group for the preparation of a dental composition.

Eleven diketo pyrrolo-pyrrole (DKPP) derivatives have been synthesized as new high performance photoinitiators and combined with various additives to initiate the free radical polymerization of methacrylates in thin and thick films under visible violet, blue, green, and yellow light irradiation (e.g. LEDs at 405 nm, 470 nm, 477 nm, 520 nm or 565 nm...

A strong drawback of the photoinitiators of cationic polymerization or photoacids is the photosensitivity for short and energetic wavelengths preventing their general use (specialized photochemical equipment with safety concerns must be used). In the present paper, a novel iodonium salt bearing a naphthalimide moiety (naphthalimide-Ph-I⁺-Ph) is pro...

The objectives of this work is to propose a novel low migration additive (i.e. a phosphine) to overcome the oxygen inhibition in camphorquinone CQ base photoinitiating system for the polymerization of methacrylates (e.g. a bisphenol A-glycidyl methacrylate (Bis-GMA)/triethyleneglycol dimethacrylate (TEGDMA) blend (70%/30% w/w)) upon exposure to a c...

Objectives: The aim of our study is to find an amine free photoinitiating system (PIS) for the polymerization of representative dental methacrylate resins. A photoinitiating system (PIS) based on camphorquinone (CQ)/triphenylgermanium hydride/diphenyl iodonium hexafluorophosphate is proposed and compared to the conventional CQ/amine couple. The po...

A short review of the role of photocatalysts in photopolymerization reactions is presented. A special emphasis is placed on photoredox catalysts leading to i)high-performance initiating systems for polymerization upon low light intensity for the use of light emitting diodes (LEDs) and/or visible light and ii)controlled radical photopolymerization (...

Isoquinolinone derivatives bearing amino- or nitro- substituent (IQNs) have been synthesized as photoinitiators and combined with various additives (i.e., iodonium salt, N-vinylcarbazole, amine or 2,4,6-tris(trichloromethyl)−1,3,5-triazine) to initiate ring-opening cationic polymerizations (CP) or free radical polymerizations under exposure to visi...

N,N'-dibutylquinacridone (DBQA) is utilized here for the first time as a high-performance panchromatic photoinitiator for the cationic polymerization (CP) of epoxides, the free radical polymerization (FRP) of acrylates, the thiol-ene polymerization and the synthesis of interpenetrated polymer networks (epoxide/acrylate) under violet, blue, green an...