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Lazauskaité, Rüta; Budreckienė, Rūta; Gražulevičius, Juozas V.; Abadie, M. J. M.

doi:10.1002/1521-3897(200006)342:6<569::aid-prac569>3.3.co;2-a

Cited by 3 publications

(3 citation statements)

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“…Epoxides show a very high reactivity under UV curing and particularly classical glycidyl epoxy [19,20] structure has been shown to be more reactive than cyclohexane oxide structure -Table 4.…”

Section: • • • • • Epoxidesmentioning

confidence: 99%

New Trends in UV Curing

Abadie¹,

Voytekunas²

2016

Eur Chem Tech J

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We present an overview of the use of photochemistry applied to polymerization and crosslinking reactions by radical or cationic process used for thin film technologies and more generally for coatings. Industrially, most of the formulations used are initiated by radical mechanism. Since the discovery by J. Crivello of iodonium and sulfonium salts, the market has been oriented to use cationic systems to crosslink monomers/oligomers. One of the main advantage of such a system is that it is not sensitive to the presence of oxygene as it is for radical mechanisms. An overview of a photosensitive formulation is presented i.e. photoinitiators, photosensitisers, monomers and/or oligomers mainly used by formulators and additives. A new technique which has been developed to study and optimise any photosensitive formulation – differential phto calorimetry DPC – and which permits to determine kinetic parameters such as enthalpy, degree of conversion, rate constant, Arrhenius parameters, etc. is also describe. Some of the main characteristics and properties of UV cured polymers like acrylates, epoxides, vinylethers and others are correlated with their structures and the photocuring conditions. Applications to thin film technologies based on acrylates, epoxides and silicones is presented. A promising area of research which opens a new route for the obtention of new structure of alternating copolymers for coatings without the use of photoinitiator and based on charge transfer complex CTC is also presented.

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Section: • • • • • Epoxidesmentioning

confidence: 99%

New Trends in UV Curing

Abadie¹,

Voytekunas²

2016

Eur Chem Tech J

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“…Previously we have studied cationic photopolymerization of oxiranes containing different elecroactive groups initiated with various photoinitiators in bulk and in solution [6,7].…”

Section: Introductionmentioning

confidence: 99%

Study of Reactivity of 3-[{Oxiran-2-yl)methoxy}methyl]-9-ethyl-9H-carbazole in Cationic Photopolymerization

Lazauskaité

Simokaitienė

Buika

et al. 2009

Designed Monomers and Polymers

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A new monomer, 3-[{(oxiran-2-yl)methoxy}methyl]-9-ethyl-9H -carbazole (OMEC), was synthesized by the reaction of 9-ethyl-3-(hydroxymethyl)carbazole with (1-chloromethyl)oxirane in the presence of KOH. Cationic photopolymerization of OMEC initiated with diphenyliodonium tetrafluoroborate (DPIB), cyclopropyldiphenylsulfonium tetrafluoroborate (CPB) and (η 5 -2,4-cyclopentadien-1-yl) [(1,2,3,4,5-η)-(1-methylethyl) benzene]-iron (+)-hexafluorophosphate (−1) (Irgacure 261) was studied. The initiator exponent was established for the photopolymerization of OMEC initiated with DPIB. The influence of the temperature and oxidizing agent benzoyl peroxide on the polymerization rate and the conversion limit of OMEC photopolymerization initiated with Irgacure 261 is discussed. An activation energy value of 17 kJ/mol was estimated for OMEC when photopolymerization was initiated with Irgacure 261. Postpolymerization reactions of OMEC were studied.

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“…Previously we have studied cationic photo-polymerization of oxiranes and vinyl ethers containing different electro-active groups initiated with various photo-initiators in bulk and in solution [12,13]. We have also studied cationic photo-cross-linking of the bifunctional 1,3-di(carbazol-9-yl)-2-propanol-based epoxy, oxetanyl and vinyl ether monomers and obtained highly crosslinked networks characterized by a high gel content and T g values ranging from 40 to 20°C [14].…”

Section: Introductionmentioning

confidence: 99%