Polyimide–polyester hybrid UV-curable powder coating / Hamideh M. Shokouhi Mehr in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1445-1459 Titre : Polyimide–polyester hybrid UV-curable powder coating Type de document : texte imprimé Auteurs : Hamideh M. Shokouhi Mehr, Auteur ; Theodore J. Hammer, Auteur ; Mark D. Soucek, Auteur Année de publication : 2021 Article en page(s) : p. 1445-1459 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Caractérisation Formulation (Génie chimique) Matériaux hybrides Polyesters Polyimides Polymères -- Synthèse Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Revêtements poudre Rhéologie Résumé : A new UV-curable maleimide-terminated polyimide was prepared and characterized using gel-permeation chromatography, infrared, and nuclear magnetic resonance spectroscopy. The polyimide was formulated with a commercially available UV-curable polyester resin via twin-screw extrusion to prepare a hybrid powder coating system. The hybrid powder coatings were cured by exposing the molten formulation to UV light. The films were studied by dynamic mechanical analysis (DMA), thermomechanical analysis, and differential scanning calorimetry. DMA highlighted the viscoelastic behavior of the films and showed that an increase in Tg was obtained with increasing polyimide content, as determined via the α-transition in the tanδ curve. Thermogravimetric analysis showed an improvement in the thermal stability of the polyester with the addition of the polyimide. Deformation resistance of the UV-cured films was investigated by SAOS and LAOS rheological methods to investigate the relative endurance of these coatings when subjected to different strains. The viscoelastic properties of the hybrid system were most improved when 16% weight percent of polyimide was added into the system. Note de contenu : - EXPERIMENTAL : Material - Synthesis of maleimide-terminated polyimide (PI) - Instrumentation and characterization - Processing parameters and formulations - Powder aplication and curing - Wide-angle X-ray scattering - Atomic Force Microscopy (AFM) - RESULTS AND DISCUSSION : POlymer synthesis and characterization - Thermal analysis - Table 1 : FTIR absorption assignment of UVECOAT, PI, and PI–PE-1 post-UV-cure - Table 2 : Summary of the UV-curable formulations (by weight %) that were used in this study - Table 3 to 5 : Summary of thermal properties of UV-curable formulations - Table 6 : Summary of the viscoelastic properties of the UV-curable formulations - Table 7 : Summary of the molecular weight and polydispersity data of the UV-cured samples - Table 8 : Represents the summary of coating properties of PI-PEs with different ratios of polyimide DOI : https://doi.org/10.1007/s11998-021-00470-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00470-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36801 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23146	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Urethane methacrylate reactive diluents for UV-curable polyester powder coatings / Theodore J. Hammer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 2 (03/2021) . - p. 333-348 Titre : Urethane methacrylate reactive diluents for UV-curable polyester powder coatings Type de document : texte imprimé Auteurs : Theodore J. Hammer, Auteur ; Hamideh M. Shokouhi Mehr, Auteur ; Coleen Pugh, Auteur ; Mark D. Soucek, Auteur Année de publication : 2021 Article en page(s) : p. 333-348 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Caractérisation Composés organiques -- Synthèse Diluants Formulation (Génie chimique) Méthacrylate d'uréthane Polyesters Revêtements organiques Revêtements poudre Stabilité au stockage Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Three urethane methacrylates, one monofunctional derivative and two di-functional derivatives with different chain lengths were used as reactive diluents in UV-curable polyester powder coatings. Each reactive diluent was formulated with a methacrylated polyester oligomer using conventional melt extrusion techniques. The effect of these compounds on zero-shear melt viscosity was investigated. Incorporation of 10 wt% reactive diluent effectively reduced the viscosity by an order of magnitude. After UV-curing, the viscoelastic, thermal, and mechanical properties of the films were characterized using dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, and tensile tests. The type and concentration of reactive diluent that was used directly influenced the glass transition temperature, modulus, % elongation-at-break, and crosslink density. Of the two di-functional reactive diluents that were used, the derivative that contained a shorter methylene spacer group resulted in more heterogeneous crosslinked networks. Note de contenu : - EXPERIMENTAL : Materials - Techniques and instrumentation - Synthesis of hydroxyl-terminated polyester - Synthesis of methacrylated polyester (MPE) - Synthesis of bis(2-hydroxyethyl)hexane-1,6-diyldicarbamate (1A) - Synthesis of 4,13-dioxo-3,14-dioxa-5,12-diaza hexadecane-1,16-diyl bis(2-methylacrylate) (HDA-EC) (1B) - Synthesis of bis(2-hydroxyethyl) ethane-1,2-diyldicarbamate (2A) - Synthesis of 4,9-dioxo-3,10-dioxa-5,8-diazadodecane-1,12-diyl bis(2-methacrylate) (2B) - Synthesis of 2-hydroxyethyl dodecylcarbamate (3A) - Synthesis of 2-((dodecylcarbamoyl)oxy)ethyl methacrylate (DDA-EC) (3B) - Acid number calculations - Powder coating formulation and application - Thin-film preparation for DMA and tensile testing - RESULTS : Synthesis of MPE resin - Synthesis of urethane methacrylates - Viscosity - Thermal properties - Mechanical and viscoelastic properties - Gel content - Wide-angle X-ray scattering - General coatings tests - Table 1 : Example formulation of 5_EDA-EC - Table 2 : Summary of the DSC and TGA data obtained from the various UV-cured samples - Table 3 : Summary of the viscoelastic data obtained from DMA experiments - Table 4 : Summary of the general coatings tests and storage stability analysis DOI : https://doi.org/10.1007/s11998-020-00391-8 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00391-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35598 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
22701	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)