Futuristic photo-initiators that can upgrade conventional ultra-violet curing technology / Pradeep S. Verma in PAINTINDIA, Vol. LXVIII, N° 2 (02/2018)  

[article]  inPAINTINDIA > Vol. LXVIII, N° 2 (02/2018) . - p. 83-89 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 Quinones Les 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 [article]

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Improvement of light fastness of natural dye : effect of ultraviolet absorbers containing benzotriazolyl moiety on the photofading of red carthamin / Hironori Oda in COLORATION TECHNOLOGY, Vol. 128, N° 2 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 2 (2012) . - p. 108-113 Titre : Improvement of light fastness of natural dye : effect of ultraviolet absorbers containing benzotriazolyl moiety on the photofading of red carthamin Type de document : texte imprimé Auteurs : Hironori Oda, Auteur Année de publication : 2012 Article en page(s) : p. 108-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Benzophénones Benzotriazole Pigments végétaux Résistance au rayonnement ultraviolet Rouge carthamine Index. décimale : 667.3 Teinture et impression des tissus Résumé : While the contribution of ultraviolet absorbers to synthetic dyes has been investigated by several workers, there have been few studies pertaining to the use of functional ultraviolet absorbers as a means of improving the light fastness of natural dyes. In this paper, numerous potential ultraviolet absorbers were prepared to prolong the life of natural dye carthamin. The effects of these compounds in reducing photofading were examined on a polymer substrate. The use of commercial ultraviolet absorbers was not necessarily useful in improving the light fastness of the colour. However, benzophenone-type ultraviolet absorbers containing a built-in ultraviolet absorber moiety markedly retarded the photofading rate. It is proposed that 2,2′,4,4′-tetrahydroxy-5-methylbenzotriazolylbenzophenone and its derivatives may be used as effective stabilisers in the fading of natural dyes. Note de contenu : - EXPERIMENTAL : Materials - 5-(2H-benzotriazole-2-yl)2,2', 4,4' - tetrahydroxybenzophenone - Photofading procedure - RESULTS AND DISCUSSION : Properties of UV absorbers - Effect of additives on the photofading of carthamin - Effect of dibenzotriazolyl derivatives on the photofading of carthamin DOI : 10.1111/j.1478-4408.2011.00352.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00352.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14883 [article]

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Novel photoinitiators - the future of ultraviolet curing technology / Yogesh B. More in PAINTINDIA, Vol. LXIV, N° 11 (11/2014)  

[article]  inPAINTINDIA > Vol. LXIV, N° 11 (11/2014) . - p. 53-60 Titre : Novel photoinitiators - the future of ultraviolet curing technology Type de document : texte imprimé Auteurs : Yogesh B. More, Auteur ; Pavan Patil, Auteur Année de publication : 2014 Article en page(s) : p. 53-60 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Benzophénones Photoamorceurs (chimie) Photoréticulation Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Ultraviolet curing process of its own explains the drying mechanism which is driven by photoinitiator, the key ingredient of the formulation. Various types of novel photoinitiators have been developed and stil under further development due to increasing demands of application and limitations of traditional photoinitiators. Minimum percentage of versatile photoinitiator with effective utilisation in UV spectrum and without any side reaction is a need of recent UV formulations as per application enhancement. Note de contenu : - PHOTOINITIATORS : Radical type of system - Ionic type of system - NOVEL PHOTOINITIATORS : Low VOC bifunctional photoinitiator - H-donor free photoinitiator - Monomeric photoinitiator - Water soluble photoinitiator - Polymeric photoinitiator - Self initiating oligomers En ligne : https://drive.google.com/file/d/1uWj7XDYeDXaX-m1Ske0wUlmQHc5zyfBh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22514 [article]

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Preparation and characterization of carnauba was nanostructured lipid carriers containing benzophenone-3 / S. P. Lacerda in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 33, N° 4 (08/2011)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 33, N° 4 (08/2011) . - p. 312-321 Titre : Preparation and characterization of carnauba was nanostructured lipid carriers containing benzophenone-3 Type de document : texte imprimé Auteurs : S. P. Lacerda, Auteur ; N. N. P. Cerize, Auteur ; M. I. Ré, Auteur Année de publication : 2011 Article en page(s) : p. 312-321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Benzophénones Caractérisation Cire de carnauba Dispersions et suspensions Lipides Nanostructures Oléate d'isodécyle Index. décimale : 668.5 Parfums et cosmétiques Résumé : Les particules lipidiques, nommées NLCs (nanostructured lipid carriers), sont de potentiels vecteurs actifs à base de mélanges de lipides solides et de lipides liquides. Dans le présent article, les dispersions aqueuses de NLCs ont été préparées par la technique chaude à haute pression d’homogénéisation à l’aide de la cire de carnauba comme lipide solide et de l’oléate d’isodécyle comme huile liquide. La taille des particules, le potentiel zêta et la capacité d’encapsuler la benzophénone-3, un filtre solaire moléculaire, ont étéétudiés pour optimiser la préparation et déterminer les paramètres de stabilité de la benzophénone-3-NLCs. Le travail illustre l’effet de la composition du mélange lipidique sur l’efficacité d’encapsulation, la libération in vitro et la stabilité de la benzophénone-3-encapsulée dans ces NLCs. Note de contenu : - MATERIALS : Methods - Preparation of lipidic nanoparticles (NLC) and their characterization - Nanoparticles characterization - In vitro experiments - RESULTS : Preparation of blank NLCs and their characterization - Occlusive properties - Penetration of fluorescence dye on the skin from NLCs - Preparation of benzophenone-3-loaded NLCs dispersions - DSC analysis - Encapsulation efficiency - Stability studies - In vitro release DOI : 10.1111/j.1468-2494.2010.00626.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1468-2494.2010.00626.x Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12325 [article]

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Reduction of yellowing effect on leathers with UV absorber benzophenone-4 / Safiye Meric Acikel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 1 (01-02/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 1 (01-02/2016) . - p. 31-38 Titre : Reduction of yellowing effect on leathers with UV absorber benzophenone-4 Type de document : texte imprimé Auteurs : Safiye Meric Acikel, Auteur ; Ahmet Aslan, Auteur Année de publication : 2016 Article en page(s) : p. 31-38 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Benzophénones Cuirs et peaux -- Finition Emulsions Résistance au jaunissement Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Besides quality in leather manufacture, another important factor is that the customer should use the product in the long term without any problem. However, a leather product, being a naturel structure, can age because of environmental conditions such as UV, temperature, and humidity, and its chemical and physical structure can change with lime. Some leather products in particular such as upholstery leathers which are exposed to sunlight can be aged and yellowed by the effects of UV light and temperature. Therefore, there is a need to prevent ageing and yellowing. UV absorbers are often used in various products such as cosmetics and polymeric materials to prevent the destructive effects of ultraviolet radiation. The aim of this work was to study use of the UV absorber benzophenone-4 in reducing yellowing. Chrome-tanned and vegetable-tanned crust leathers were given a coating of hydro lacquer (lacquer emulsion) including the UV absorber benzophenone-4 as a finishing process. After exposure to monochromatic UV light at a wavelength of 340nm for 24, 48, 72, 96, 120, 144 or 168 hours at approximately 80°C. The results were investigated by CIE Lab Colour measurement and by FTIR-ATFI spectrophotometer. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - - RESULTS AND DISCUSSION : Colour results - ATR-FTIR results En ligne : https://drive.google.com/file/d/1nRmgjKsisOTscf7ZyulkeGZ1GLwnHI8j/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25559 [article]

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UV curing for the uninitiated / Richard Kennedy in SURFACE COATINGS INTERNATIONAL, Vol. 104.4 (07-08/2021)  

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