Accelerated weathering of oligomers by UV-B / Inwhan Oh in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4666 (12/2020)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4666 (12/2020) . - p. 18-21 Titre : Accelerated weathering of oligomers by UV-B Type de document : texte imprimé Auteurs : Inwhan Oh, Auteur ; Hak-Yul Kim, Auteur ; Sungseo Cho, Auteur ; Indrajit Bhattacharya, Auteur Année de publication : 2020 Article en page(s) : p. 18-21 Langues : Anglais (eng) Catégories : Copolymère uréthane acrylate Essais de résilience Oligomères Photoréticulation Polymères -- Effet du rayonnement ultraviolet Polymères -- Détérioration Polymères aliphatiques Index. décimale : 667.9 Revêtements et enduits Résumé : Ultra Violet (UV) energy curing is one of the fastest crosslinking techniques used to dry coatings. UV curable coatings are also one of the most environmentally friendly coating systems as they are typically solvent-free (extremely low VOC/HAPS). Oligomers being almost 100% solids (ppm level solvent residues) have low to medium average molecular weights. Hence, they are liquid at room temperatures. Some oligomers contain some monomers to help reduce their viscosity, to make it easy for the formulator to handle them. However, some industry players do not believe UV curing is really a good solution for outdoor durable coatings. Hence, Miwon Specialty Chemical Co Ltd (MSC) decided to study the performance of some its aliphatic urethane acrylates under accelerated conditions to determine their durability. This paper discusses the tests and the performance that can be achieved when certain well-designed oligomers are exposed to harsh conditions. Note de contenu : - UV curing - Weathering test equipment - Preparing the test - Exposure test and results - Table 1 : Description of oligomers - Table 2 : Results using ASTM G154 cycle B test for the five products - Table 3 : Measurements taken after 1500hr and 2000hr - Table 4 : Results after testing to ASTM G154 at 1000hr - Table 5 : Results after testing to ASTM G154 at 2000hr En ligne : https://drive.google.com/file/d/15yJ7l-CBWLmw0F4QT0uzIQzdG-z6gbGO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36740 [article]

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Accelerated weathering of oligomers by UV-B / Inwhan Oh in PAINTINDIA, Vol. LXXI, N° 10 (10/2021)  

[article]  inPAINTINDIA > Vol. LXXI, N° 10 (10/2021) . - p. 72-80 Titre : Accelerated weathering of oligomers by UV-B Type de document : texte imprimé Auteurs : Inwhan Oh, Auteur ; Hak-Yul Kim, Auteur ; Indrajit Bhattacharya, Auteur ; Sungseo Cho, Auteur Année de publication : 2021 Article en page(s) : p. 72-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère uréthane acrylate Essais accélérés (technologie) Oligomères Photoréticulation Polymères -- Effet du rayonnement ultraviolet Polymères -- Détérioration Polymères aliphatiques Index. décimale : 667.9 Revêtements et enduits Résumé : Ultra Violet (UV) energy curing is one of the fastest crosslinking techniques used to dry coatings. UV curable coatings are also one of the most environmentally friendly coating systems as they are typically solvent-free (extremely low VOCIHAPS). Oligomers being almost 100 % solids (ppm level solvent residues) have low to medium average molecular weights. Hence, they are liquid at room temperatures. Some Oligomers contain some monomers, to help reduce their viscosity, to make the formulators job easy to handle them. However, some industry players do flot believe UV curing is really a good solution for Outdoor durable coatings. Hence Miwon Specialty Chemical Co. Ltd. (MSC) decided to study the performance of some its Aliphatic Urethane acrylates under accelerated conditions to determine their durability. The paper discusses the tests and the performance that can be achieved when certain well-designed Oligomers are exposed to harsh conditions. Note de contenu : - UV curing - Wheathering test equipment - Preparing the test - Exposure test and results En ligne : https://drive.google.com/file/d/1d1nS47mEYceJ5_92Uu40Fc1W6Jo9VmH-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36881 [article]

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Development of low cost degradable polyester fibers / C. C. Lam in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 1 (03/2016)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 1 (03/2016) . - p. 25-28 Titre : Development of low cost degradable polyester fibers Type de document : texte imprimé Auteurs : C. C. Lam, Auteur ; Winnie Wu, Auteur Année de publication : 2016 Article en page(s) : p. 25-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mélanges-maîtres (chimie) Nontissés Oxobiodégradation Polyesters Polyéthylène téréphtalate Polymères -- Effet du rayonnement ultraviolet Polymères -- Biodégradation Index. décimale : 677.4 Textiles artificiels Résumé : Transition metal pro-oxidants formula for degradable polyester has been successfully developed and is applicable for nonwovens sheets production. With the masterbatch concept and technology, manufacturers interested in degradable products can simply introduce the degradable masterbatch into their existing production process. The approach is cost effective since no additional equipment and investment are involved. The estimated extra expense of the degradable nonwovens production is mainly from the pro-oxidants, and it is anticipated that the total cost will only increase 3-5%, while the market price of degradable products could be around 10-300% higher than the traditional ones. However, by using this technology, functional advantages of synthetic fibers such as high wear resistance and low moisture absorption properties could also be maintained, the disposable and degradable synthetic fibers can be applied to manufacture of disposable health and medical products such as hairnet, mask, isolation gown etc. It could also be extended to produce other degradable nonwovens materials such as filters which have specific expiration dates and need to be replaced periodically. En ligne : https://drive.google.com/file/d/1fMLNXOukaOZWfZCFCXNzG8pFlu37lw1W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25840 [article]

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Development of a recycled polymer coating for steel corrosion protection : An adhesion study / F. Bourgés-Ficoteaux in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 884 (09/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 884 (09/1998) . - p. 63-69 Titre : Development of a recycled polymer coating for steel corrosion protection : An adhesion study Type de document : texte imprimé Auteurs : F. Bourgés-Ficoteaux, Auteur ; O. Savadogo, Auteur Année de publication : 1998 Article en page(s) : p. 63-69 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Adhésion Anticorrosion Béton armé Matières plastiques -- Recyclage Métaux -- Revêtements protecteurs Photodétérioration Polyéthylène téréphtalate Polymères -- Effet du rayonnement ultraviolet Polymères -- Effets de la température Revêtement en plastique Revêtements -- Effets du rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : The potential of recycled poly(ethylene terephtalate) (PET) as a surface coating for steel corrosion protection, using a vinyl resin coating (PVC) as a control was studied. This investigation led us to develop a method to measure the adhesion strength of plastic coatings on steel under specific environmental conditions (temperature and UV exposure). All the results obtained showed that recycled PET presented very good adhesion on steel and that temperature and UV exposure induced only insignificant loss of adhesion. The results also showed that UV exposure induced a slight degradation of the PET. Note de contenu : - EXPERIMENTAL : Materials - Procedure for the PET coating - Procedure for the PVC coating - Cyclic temperature test - UV exposure - Adhesion measurement of coating on steel - RESULTS : Adhesion comparison between the different coatings - Influence of the coating thickness - Influence of the steel pretreatement on the coating adhesion strength - Influence of the cyclic temperature test on the adhesion of different coatings - Influence of the UV radiation on adhesion Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18032 [article]

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Effect of process conditions on the properties of surface-modified organic pigments encapsulated by UV-curable resins / Osama Abdel Hakeim in COLORATION TECHNOLOGY, Vol. 134, N° 1 (02/2018)  

[article]  inCOLORATION TECHNOLOGY > Vol. 134, N° 1 (02/2018) . - p. 44-58 Titre : Effect of process conditions on the properties of surface-modified organic pigments encapsulated by UV-curable resins Type de document : texte imprimé Auteurs : Osama Abdel Hakeim, Auteur ; A. A. Arafa, Auteur ; M. K. Zahran, Auteur ; L. A. W. Abdou, Auteur Année de publication : 2018 Article en page(s) : p. 44-58 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Dispersions et suspensions Encapsulation Miniémulsions Monomères Pigments organiques Polymères -- Effet du rayonnement ultraviolet Traîtements de surface Index. décimale : 667.3 Teinture et impression des tissus Résumé : Aqueous dispersions of nanoscale organic pigments were successfully prepared via ball milling and ultrasonication. The dispersed organic pigments were encapsulated into UV-curable resins via a mini-emulsion technique. Critical factors that affected the dispersion and encapsulation stability were investigated. The encapsulated organic pigments were characterised with transmission electron microscopy, thermogravimetric analyses, Fourier Transform-infrared spectra and zeta potential. The results clarified that the type of dispersing agent plays an important role in achieving maximal dispersion stability. Encapsulated organic pigments showed greater dispersion stability, and better wettability than the original pigments. Polyester tetra-acrylate oligomer can stabilise the mini-emulsion from diffusion degradation and inhibit phase separation with time. 1,6-Hexandiol dimethacrylate was the monomer of choice for ink-jet printing inks. Furthermore, it was found that monomer/oligomer and pigment/resin ratios were more influential and needed to be optimised. Thermal analysis, ultracentrifuge sedimentation and morphologies provided supporting evidence for the encapsulation of organic pigments into UV-curable resins. Note de contenu : - METHODS : Preparation of nanoscale organic pigment dispersions - PREPARATION OF NANOPIGMENT DISPERSIONS : Effect of dispersing agent type - Effect of dispersing agent concentration - ENCAPSULATION OF ORGANIC PIGMENT INTO UV-RESINS : Effect of encapsulation on pigment morphology and size distribution - Effect of encapsulation on dispersion stability - Effect of monomer type on encapsulation stability - Effect of monomer/oligomer ratio on encapsulation stability - Effect of pigment/resin ratio on encapsulation stability - CHARACTERISATION OF ENCAPSULATED PIGMENTS DOI : 10.1111/cote.12318 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12318 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30126 [article]

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Effect of tio2 pigment type on the uv degradation of filled coatings / Deborah L. Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)  

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Influence de l'irradiation à l'ultraviolet sur les propriétés mécaniques d'un mélange d'amidon et de PLA/PBTA / Masahiro Nishida in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 22, N° 1 (01-02-03-04/2012)

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Ultraviolet and weathering testing / Sam Fishlock in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 201, N° 4564 (09/2011)  

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Vers des polymères autoréparants / Cécile Michaud in LA RECHERCHE, N° 430 (05/09)

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Weathering properties of polymers / Tipanna Melkeri in PAINTINDIA, Vol. LXXI, N° 2 (02/2021)  

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