UV crosslinking of acryloyl functional polymers in the presence of oxygen

Awokola, M; Lenhard, W; Löffler, H.; Flosbach, Carmen; Frese, Peter

doi:10.1016/s0300-9440(02)00015-2

Cited by 28 publications

(15 citation statements)

References 3 publications

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“…Iron oxide NPs. The photocatalytic AA polymerization in the presence of air is of considerable interest first of all from the practical viewpoints, for example, for the photochemical PAA synthesis or for the design of photocurable compositions [61,62]. So, the kinetics of the photocatalytic polymerization was studied mostly in air-exposed systems.…”

Section: Influence Of Photoinitiator Concentration Cds and CD X Zn 1mentioning

confidence: 99%

Semiconductor Nanocrystals and Graphene Oxide as Visible-Light-Sensitive Photoinitiators of Acrylamide Polymerization in Water

Stroyuk¹,

Kuchmiy²,

Andryushina³

2015

Him. Fiz. Tehnol. Poverhni

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Photopolymerization of acrylamide in aqueous solutions induced by visible light (>400 nm) absorbed by colloidal particles of Cd x Zn 1-x S, Fe 2 O 3 and graphene oxide is reported. Depending on the photoinitiator nature, primary radicals are generated by monomer reduction with conduction band electrons (Cd x Zn 1-x S), monomer oxidation by the valence band holes (Fe 2 O 3) or by interaction between monomer and free radicals photoeliminated from graphene oxide. The photopolymerization rate increases proportionally to the conduction band potential of Cd x Zn 1-x S nanoparticles that depends on their composition. The Fe 2 O 3-initiated acrylamide photopolymerization proceeds with comparable effectiveness in both deaerated and air-exposed aqueous solutions, the feature differing drastically from typical organic photoinitiators. On the basis of kinetic parameters the photopolymerization process was found to be of the chain free radical character with a principal chain termination route being macro-radicals recombination. The kinetic data also indicate a possibility of participation of the Cd x Zn 1-x S nanoparticles and graphene oxide in the chain termination.

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Section: Influence Of Photoinitiator Concentration Cds and CD X Zn 1mentioning

confidence: 99%

Semiconductor Nanocrystals and Graphene Oxide as Visible-Light-Sensitive Photoinitiators of Acrylamide Polymerization in Water

Stroyuk¹,

Kuchmiy²,

Andryushina³

2015

Him. Fiz. Tehnol. Poverhni

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“…This can be done by increasing the amount of photoinitiator or by intensifying the UV light. 22 High-intensity UV sources minimize but do not eliminate the problem with fast-curing systems. In effect, free radicals can be generated so rapidly that their high concentration can deplete the oxygen at the film surface, permitting other radicals …”

Section: Oxygen Inhibitionmentioning

confidence: 99%

UV-Curable Coating Technologies

Soucek

Xue-ping

2014

Photocured Materials

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UV-curable coatings have witnessed a fast development during the last several decades. This chapter deals with the concept, components, classification, and development of UV-curable coatings. It begins with an introduction of UV-curable coatings, followed by a general description of UV energy and relevant equipment. The components of UV-curable coatings, i.e. photoinitiator, reactive oligomer, and reactive diluent, are discussed in detail. The mechanisms of free-radical photopolymerization and cationic photopolymerization, as well as the advantages and disadvantages of both methods are described. The evaluations of the cure content are listed and compared. Several specific examples are given in terms of the development and prospects of UV-curable coatings.

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“…Therefore, we should define the key parameters which will affect the polymerization in order to get the best film quality. The influence of the UV crosslinking on the polymer when polymerization takes place in the presence of air has already been investigated [13]. Oxygen inhibition causes numerous deleterious effects on free-radical formed by photolysis of the initiator are rapidly scavenged by oxygen molecules to yield peroxylradicals.…”

Section: Cs Kuang Et Al / Science and Technology Of Advanced Matermentioning

confidence: 99%