[article]
| Titre : |
Futuristic photo-initiators that can upgrade conventional ultra-violet curing technology |
| Type de document : |
texte imprimé |
| Auteurs : |
Pradeep S. Verma, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 83-89 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Benzophénones
Photoamorceurs (chimie)
Photoréticulation
Polyéthylène glycol
Polymères hydrosolubles
QuinonesLes quinones constituent une série de diènes plutôt que des composés aromatiques comportant un noyau de benzène sur lequel deux atomes d'hydrogène sont remplacés par deux atomes d'oxygène formant deux liaisons carbonyles (dicétones éthylèniques conjuguées cycliques).
Les quinones sont des transporteurs d'électrons dans la membrane mitochondriale interne et dans la membrane des thylakoïdes.
Les principales quinones sont : la benzoquinone ou quinone (C6H4O2), découverte en 1838 par Wosrerenski, chimiste polonais, dont on utilise les propriétés rédox dans la technique de développement photographique. C'est l'un des deux isomères de la cyclohexadienedione. L'orthobenzoquinone est la 1,2-dione, alors que la parabenzoquinone, est la 1,4-dione.
Revêtements -- Séchage sous rayonnement ultraviolet
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
This article represents work done on photoinitiators to enhance and upgrade the conventional mechanism of UV curable coatings. Hybrid organic—inorganic macro photoinitiator bearing pendant tertiary amine groups (0I-AH) was prepared by hydrolytic condensation of a silane containing amino groups. The macromolecular amino-functionalized photo-initiator was used in combination with Carnphor Quinone (CQ) for visible-light photo-polymerization. The evolution of monomer conversion versus irradiation time showed that the 0I-AH are efficient co-initiator of CQ because a fast reaction and hie, conversion result after 60 s irradiation with a LED source of 600 mW/cm2.
Polymerizable organosilicon macromolecular photo-initiator HHMP-Si-CC not only spontaneously form a
concentration gradient in the photo-polymerization system, initiate gradient photo-polymerization and effectively
mitigate inhibition of oxygen, but also overcome the migration of photolysis fragments of the photo-initiator from UV-curable material. HHMP-Si-CC should have potential applications for preparing more environnnentally friendly gradient materials.
A novel polymeric photo initiator, poly (glycidyl benzophenone ether) (PGBE), with a side-chairs benzophenone (BP) group was synthesized from poly(epichlorohydrin) and 4-hydroxybenzophenone. The obvious advantage of this initiator was the elimination of amine based hydrogen donors and to provide alternative hydrogen donors with easy availability and non-toxicity. The polymeric initiator was found to have higher efficiency than BP/E AB (Ethy14- dimethylaminolbenzoate).
Polymeric benzophenone photo-initiator (PEG-BP) was synthesized basing on polyethylene glycol (PEG), succinic anhydride, 4-hydroxy benzophenone and epichlorohydrin. The obvious advantage of this initiator was the elimination of amine based hydrogen donors and to provide alternative hydrogen donors with easily availability and non toxicity. The synthesized polymeric photo-initiators are attractive to.be used as type II photo-initiators. Moreover, the water solubility of PEG provides the use of initiating system in water-borne formulations. Therefore, it is expected that the synthesized polymeric photo-initiators are attractive to be used as type II photoinitiators. |
| Note de contenu : |
- HYBRID ORGANIC-INORGANIC MACROMOLECULAR PHOTO-INITIATOR SYSTEM FOR VISIBLE-LIGHT PHOTO-POLYMERIZATION : Synthesis of hybrid organic-inorganic amine-functionalized photo-initiator (OI-AH)
- A NOVEL POLYMERIZABLE POLYSILOXANE α-hydroxyl alkylphenones photo-initiator
- NOVEL POLYMERIC PHOTO-INITIATORS WITH SIDE-CHAIN BENZOPHENONE : Synthesis and structural characterization of photo-initiators - UV/Vis spectral characterization of photo-initiators - Possible photoreaction mechanism of PGB
- NOVEL ONE-COMPONENT POLYMERIC BENZOPHENONE PHOTO-INITIATOR CONTAINING POLY(ETHYLENE GLYCOL) AS HYDROGEN DONOR : Synthesis of PEG-BP - Possible photoreaction mechanism of PEG-BP
- FIGURES : 1. Epoxy-amine reaction between TSPA and PGE to give the TSPAP silane - 2. Representative structures resulting from the hydrolytic condensation of TSPAP - 3. The structure was confirmed by FTIR, 1H NMR and UV-VIS spectroscopy - 4. FTIR spectra for HHMP and HHMP-Si-CC - 5. 1H NMR spectra of A-Si and HHMP-Si-CC - 6. UV-Vis absorption spectra of HHMP and HHMP-Si-CC - 7. Synthesis of poly(glycidyl benzophenone ether) - 8. 1H NMR spectra of PGBE and PECH - 9. UV/vis absorption spectra of BP and PGBE - 10. Synthesis route of PEG-BP - 11. FT-IR spectra of PEG-BP and EBP |
| En ligne : |
https://drive.google.com/file/d/1YF3Hxdz1_Vi8JkCnuDCy6fR-SVQ9ACRF/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30343 |
in PAINTINDIA > Vol. LXVIII, N° 2 (02/2018) . - p. 83-89
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Futuristic photo-initiators that can upgrade conventional ultra-violet curing technology in PAINTINDIA, Vol. LXVIII, N° 2 (02/2018)
