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Biobased UV-curable coatings based on itaconic acid / Sara Brännström in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
[article]
Titre : Biobased UV-curable coatings based on itaconic acid Type de document : texte imprimé Auteurs : Sara Brännström, Auteur ; Eva Malmström, Auteur ; Mats Johansson, Auteur Année de publication : 2017 Article en page(s) : p. 851-861 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux
Itaconique, Acide
Polyesters insaturésLes résines de polyesters insaturés (UP) sont obtenues par polycondensation
d’un ou de plusieurs diacides avec un ou plusieurs glycols, l’un, au moins, des constituants contenant une double liaison éthylénique susceptible de réagir ultérieurement sur un composé vinylique, acrylique ou allylique.
Par le terme résine polyester, on désigne en fait la dissolution du prépolymère polyester insaturé dans un solvant copolymérisable, le plus utilisé étant le styrène. C’est sous cette forme liquide que les résines polyesters sont livrées aux transformateurs.
Après addition de différents adjuvants, charges et renforts, divers procédés de transformation provoquent, sous l’action d’un système catalytique approprié, la copolymérisation finale de la résine en un objet thermodurcissable.
Les polyesters insaturés sont d’un usage relativement ancien (1950), essentiellement
dans le bâtiment (moulage au contact). Ils ont connu un renouveau important à partir de 1980, en particulier au niveau des formulations et de la fiabilité des procédés grâce au développement de technologies industrielles de moulage par injection et par compression dans l’industrie automobile.
Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultraviolet
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : A series of renewable unsaturated polyesters were synthesized from itaconic acid (IA), succinic acid, and 1,4-butanediol by solvent-free polycondensation. Previous studies utilizing IA to make polyesters for coating applications have shown great potential; however, the curing and material properties have not been investigated in detail. The aim of this study was to investigate how the curing is affected by the amount of unsaturations and how well itaconate-based polyesters crosslink without the addition of any other unsaturated monomers or reactive diluents. The chemical structures of the polyesters were confirmed with FTIR, 1H-NMR, and THF–SEC. The degree of curing was studied with FTIR, and the mechanical properties of the crosslinked polyesters were evaluated with DMA, pendulum hardness, and microindentation. The degree of curing was found to be up to 75%, and furthermore, it was found that the final mechanical properties of the crosslinked coatings could be tuned by modifying the IA content in the monomer composition. The results from DMA showed that there is a clear trend between mechanical properties and crosslinking density. Note de contenu : - EXPERIMENTAL : Materials - Analyses - Synthesis of unsaturated polyesters - UV curing and film formation
- RESULTS AND DISCUSSION : Effects of reaction conditions and monomer composition on the obtained resin structure - Curing performance and final coating propertiesDOI : 10.1007/s11998-017-9949-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9949-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28927
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible Fully bio-based aliphatic thermoset polyesters via self-catalyzed self-condensation of multifunctional epoxy monomers directly extracted from natural sources / Samer Nameer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
[article]
Titre : Fully bio-based aliphatic thermoset polyesters via self-catalyzed self-condensation of multifunctional epoxy monomers directly extracted from natural sources Type de document : texte imprimé Auteurs : Samer Nameer, Auteur ; Mats Johansson, Auteur Année de publication : 2017 Article en page(s) : p. 757-765 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biomatériaux
Catalyse
Composés aliphatiques
Epoxydes
Polymères aliphatiques
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : The use of bio-based raw material is regarded as a sustainable way to address environmental concerns. A naturally occurring monomer, 9,10-epoxy-18-hydroxyoctadecanoic acid (EFA), was retrieved from outer birch bark. A series of model experiments revealing relative reaction rates for epoxide, carboxylic acid, and alcohol functional groups was investigated. Real-time Fourier transform infrared spectroscopy and nuclear magnetic resonance were used to follow the different model experiments. The results on the model systems were then compared to the thermoset formation of thermally cured EFA. Finally, the adhesive properties of crosslinked EFA on different substrates were evaluated. Note de contenu : - EXPERIMENTAL : Materials - Procedures - Analytical techniques
- RESULTS AND DISCUSSION : Relative reaction rates in model systems - The reaction of EFA at elevated temperature toward a thermoset structure - Crosslinking of EFA-based thermoset between different substratesDOI : 10.1007/s11998-017-9920-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9920-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28918
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible Hyperbranched polyesters / Mats Johansson in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/02 (07-08/2002)
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Titre : Hyperbranched polyesters : Basis for low temperature powder coatings Type de document : texte imprimé Auteurs : Mats Johansson, Auteur ; Eva Malmström, Auteur ; Anders Hult, Auteur ; Hans Claesson, Auteur Année de publication : 2002 Article en page(s) : p. 26-33 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basses températures
Polyesters
Polymères ramifiés
Revêtements poudre:Peinture poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : A dendritic polymer is used as scaffolds for solid thermoset resins i.e. powder coatings. To make it crosslinkable there is a concept of attaching crystalline segments to a dendritic polymer and subsequent functionalization. The rheological performance of these structures makes it possible to reduce the film formation temperature to 80°C thus enabling heat sensitive substrates such as wood and polymers to be coated. The effects of structural variations on the rheological and mechanical properties are shown. The main factors affecting the final properties is the length of the crystalline grafts while the core structure induces only smaller differences in properties. The obtained resins are UV-curable with little or very low levels residual unsaturation present in the cured films. Note de contenu : - Powder coatings : curing temperature of 150°C should be reduced
- Radiation curable systems need less heat
- Another way : low temperature curable hyperbranched polymers
- Hyperbranched polymers are synthetized
- Photopolymerization at 70°C
- High polarity end-groups increase viscosity
- Graft length dominates viscosity and degree of crystallinity
- Crosslinking and final film propertiesEn ligne : https://drive.google.com/file/d/1jKP_OIqA7J4lkv8kVKeJ2IGK7PTy3d9f/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10726
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Code-barres Cote Support Localisation Section Disponibilité 000645 - Périodique Bibliothèque principale Documentaires Disponible Novel concept for low temperature curing powder coatings based on hyperbranched polyesters / Mats Johansson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 906 (07/2000)
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Titre : Novel concept for low temperature curing powder coatings based on hyperbranched polyesters Type de document : texte imprimé Auteurs : Mats Johansson, Auteur ; Eva Malmström, Auteur ; Andreas Jansson, Auteur ; Anders Hult, Auteur Année de publication : 2000 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Basses températures
Copolymères greffés
Peinture poudre -- Séchage sous rayonnement ultraviolet
Polyesters
Polymères aliphatiques
Polymères cristallins
Polymères ramifiés
Réticulation (polymérisation)
Revêtements poudre:Peinture poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : The concept of using hyperbranched polymers as scaffolds for solid thermoset resin applications is described. A series of semi-crystalline methacrylate-functional aliphatic polyesters has been synthesized and characterized for applications as solid thermoset resin, e.g., powder coating resins. The polyester resins have been crosslinked by UV irradiation producing either amorphous or semi-crystalline crosslinked films depending on the initial structure. The resins are based on hyperbranched aliphatic polyesters onto which crystalline linear aliphatic polyester chains have been grafted and end-capped with methacrylate moieties. The resins exhibit a rheological behavior suitable for low temperature curing powder coatings, i.e., films that can be readily formed and UV cured at temperatures below 80°C. Note de contenu : - SYNTHESIS : General procedure for grafting of poly(epsilon-caprolactone) (epsilon-PCL) polyesters 1 and 2 exemplified by synthesis of P2G-epsilonPCL(DP=10),3 - General procedure for methacrylation of the hydroxy-functional polymers 3-6 exemplified by the synthesis P2G-epsilonPCL(DP=10)-MA - UV curing (crosslinking) of polyesters 7-10:
- CHARACTERIZATION TECHNIQUES : Rheology - Thermal characterization - Residual unsaturation - Microscopy - Photo DSC - Dynamic mechanical properties
- SYNTHESIS : Graphting of epsilon-caprolactone onto the hyperbranched polyesters - Methacrylate functionalization - Rheological and physical properties of polyesters 7-10 before crosslinking - Curing performance of resins 7-10 - Mechanical propertier of UV-cured films of resins 7-10Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17985
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Code-barres Cote Support Localisation Section Disponibilité 001211 - Périodique Bibliothèque principale Documentaires Disponible On the synthesis and characterization of new low temperature curing powder coatings cured with radiation / Mats Johansson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 884 (09/1998)
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Titre : On the synthesis and characterization of new low temperature curing powder coatings cured with radiation Type de document : texte imprimé Auteurs : Mats Johansson, Auteur ; Henrik Falkén, Auteur ; Axel Irestedt, Auteur ; Anders Hult, Auteur Année de publication : 1998 Article en page(s) : p. 57-62 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cristallisation
Liants
Monomères
Peinture poudre -- Séchage sous rayonnement ultraviolet
Polyacrylates
Polyméthacrylates
Réticulation (polymérisation)Index. décimale : 667.9 Revêtements et enduits Résumé : The synthesis and characterization of a new type of low temperature curing powder coating is described. The type of materials used were mixtures of an amorphous methacrylate-functional prepolymer and crystalline acrylate and methacrylate monomers. The introduction of a crystalline component in an amorphous resin mixture was shown to markedly reduce the melt viscosity and thus enhance the flow properties of the powder coating. Curing experiments showed the advantage of using photoinitiation compared to thermal initiation. The reaction was much faster and the problem with oxygen inhibition could be avoided. Note de contenu : - EXPERIMENTAL : Materials and synthesis - Equipment - Mixtures - Rheology - Spontaneous crystallization - Shear induced crystallization - Melting process - Curing
- RESULTS AND DISCUSSION : Synthesis - Crystallization - Melting process - Curing - Thermal curingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18031
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Code-barres Cote Support Localisation Section Disponibilité 003553 - Périodique Bibliothèque principale Documentaires Disponible Properties of powder coatings in load carrying construction / Daniel Stahlberg in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 6 (04/2005)
PermalinkSynthesis, characterization, and UV curing of acrylate functional hyperbranched polyester resins / Mats Johansson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 849 (10/1995)
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