Photoinitiation of cationic polymerization by visible light activated titanocene in the presence of onium salts

Degirmenci, Mustafa; Önen, Aysęn; Yaǧcı, Yusuf; Pappas, S. Peter

doi:10.1007/s002890170030

Cited by 50 publications

(37 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to extract the parameter values we first fix A 532 = 1.2 ϫ 10 5 cm 2 / mol, which is found from the absorption spectrum in Ref. 17. We note that this value is consistent with our results.…”

Section: Experimental Results and The Estimated Parameter Valuessupporting

confidence: 78%

“…The amount of exposing light absorbed by the photoinitiator and the photoproducts depend on their concentrations and molar absorption coefficients. The values of the molar absorption coefficient for Irgacure 784 can be found from its absorption spectrum, 17 A 532 = 1.2ϫ 10 5 cm 2 / mol. The values used for the isomer A ‫ء‬ , A ‫ء‬ 532 = 1.3ϫ 10 5 cm 2 / mol, and photocleaved intermediate B, B 532 = 4.3ϫ 10 4 cm 2 / mol, are chosen in order to resemble the reported behavior.…”

Section: B Simulated Transmission Curvesmentioning

confidence: 99%

“…The wavelength dependent absorption characteristics of Irgacure 784 are well documented. 17 It absorbs strongly from the UV region up to ϳ560 nm, and is transparent at longer wavelengths. 14 In our experiments we expose using a diodepumped solid-state green laser, operating at a wavelength of 532 nm.…”

Section: ͑10͒mentioning

confidence: 99%

“…3,10,14,[17][18][19][20] In this study we follow Ref. 19 and assume that isomerization takes place before the photocleaving of the generated isomer.…”

Section: The Chemistry Of Photoinitiationmentioning

confidence: 99%

See 3 more Smart Citations

Photoinitiation study of Irgacure 784 in an epoxy resin photopolymer

Sabol

Gleeson

Shui

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

A deeper understanding of the processes, which occur during free radical photopolymerization, is necessary in order to develop a fully comprehensive model, which represents their behavior during exposure. One of these processes is photoinitiation, whereby a photon is absorbed by a photosensitizer producing free radicals, which can initiate polymerization. These free radicals can also participate in polymer chain termination ͑primary termination͒, and it is therefore necessary to understand their generation in order to predict the temporally varying kinetic effects present during holographic grating formation. In this paper, a study of the photoinitiation mechanisms of Irgacure 784 photosensitizer, in an epoxy resin matrix, is presented. We report our experimental results and present a theoretical model to predict the physically observed behavior.

show abstract

Section: Experimental Results and The Estimated Parameter Valuessupporting

confidence: 78%

Section: B Simulated Transmission Curvesmentioning

confidence: 99%

Section: ͑10͒mentioning

confidence: 99%

“…3,10,14,[17][18][19][20] In this study we follow Ref. 19 and assume that isomerization takes place before the photocleaving of the generated isomer.…”

Section: The Chemistry Of Photoinitiationmentioning

confidence: 99%

See 2 more Smart Citations

Photoinitiation study of Irgacure 784 in an epoxy resin photopolymer

Sabol

Gleeson

Shui

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…77 Both cleavable and bimolecular hydrogen abstracting type photoinitiating systems, acting in the visible range, are well-known. Titanocene 77,87,88 and camphorquinone 89 in conjunction with an amine are typical examples for the respective systems. Recently, organic ketones containing germanium were introduced as a new class of cleavable photoinitiators 90,91 for free radical polymerization under visible light irradiation.…”

Section: Free Radical Systemsmentioning

confidence: 99%

Photoinitiated Polymerization: Advances, Challenges, and Opportunities

2010

Self Cite

View full text Add to dashboard Cite

The use of photoinitiated polymerization is continuously growing in industry as reflected by the large number of applications in not only conventional areas such as coatings, inks, and adhesives but also high-tech domains, optoelectronics, laser imaging, stereolithography, and nanotechnology. In this Perspective, the latest developments in photoinitiating systems for free radical and cationic polymerizations are presented. The potential use of photochemical methods for step-growth polymerization is also highlighted. The goal is, furthermore, to show approaches to overcome problems associated with the efficiency, wavelength flexibility, and environmental and safety issues in all photoinitiating systems for different modes of activation. Much progress has been made in the past 10 years in the preparation of complex and nanostructured macromolecules by using photoinitiated polymerizations. Thus, the new and emerging applications of photoinitiated polymerizations in the field of biomaterials, surface modification, preparation of block and graft copolymers, and nanocomposites have been addressed.

show abstract

Cationic Photoinitiating Systems

Fouassier

Lalevée

2012

Photoinitiators for Polymer Synthesis

View full text Add to dashboard Cite

Photoinitiation of cationic polymerization by visible light activated titanocene in the presence of onium salts

Cited by 50 publications

References 0 publications

Photoinitiation study of Irgacure 784 in an epoxy resin photopolymer

Photoinitiation study of Irgacure 784 in an epoxy resin photopolymer

Photoinitiated Polymerization: Advances, Challenges, and Opportunities

Cationic Photoinitiating Systems

Contact Info

Product

Resources

About