2 résultat(s) recherche sur le tag 'Esteruréthanne'

Mechanical property changes and degradation during accelerated weathering of polyester-urethane coatings / allen Skaja in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 1 (01/2006)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 1 (01/2006) . - p. 41-51 Titre : Mechanical property changes and degradation during accelerated weathering of polyester-urethane coatings Type de document : texte imprimé Auteurs : allen Skaja, Auteur ; Dilhan Fernando, Auteur ; Stuart G. Croll, Auteur Année de publication : 2006 Article en page(s) : p. 41-51 Note générale : bibliogr. Langues : Américain (ame) Tags : Vieillissement  physique  Propriété  mécanique  chimique  Structure  moléculaire  Etude  expérimentale  Durabilité  Uréthanne  polymère  produit  Résistance  intempérie  Dégradation  photochimique  Mécanisme  réaction  Relaxation  structurale  Densité  réticulation  Matériau  revêtement  Esteruréthanne  accéléré  Temps  exposition  Module  élasticité Index. décimale : 667.9 Revêtements et enduits Résumé : Chemical changes, measured using spectroscopy, and crosslink density, measured by mechanical thermal analysis, were determined during accelerated weathering on a model polyester-urethane coating of known composition. The tensile modulus, measured above the glass transition temperature, and thus the crosslink density, decreased with exposure, as expected from the chemical changes. However, the tensile modulus, measured at room temperature, increased with exposure. Physical aging of the polymer network was found to occur concurrently with photodegradation and accounts for much of the increase in room temperature modulus. Increased hydrogen bonding in the increasingly oxidized polyester-urethane may also contribute to the increase in modulus at room temperature. Both physical and chemical changes must be determined if changes, and rates of change, in performance due to weathering are to be understood. DOI : 10.1007/s11998-006-0004-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0004-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3711 [article]

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Preparation of modified polyesters containing triphosphorous and their applications to PU flame-retardant coatings / Hong-Soo Park in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 1 (01/2006)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 1 (01/2006) . - p. 53-60 Titre : Preparation of modified polyesters containing triphosphorous and their applications to PU flame-retardant coatings Type de document : texte imprimé Auteurs : Hong-Soo Park, Auteur ; Hyuk-Jae You, Auteur ; Hye-Jin Jo, Auteur ; Il-Woo Shim, Auteur ; Hyun-Sik Hahm, Auteur ; Seong-Kil Kim, Auteur ; Young-Geun Kim, Auteur Année de publication : 2006 Article en page(s) : p. 53-60 Note générale : Bibliogr. Langues : Américain (ame) Tags : Esteruréthanne  copolymère  Propriété  thermique  Copolymère  organométalloïdique  Uréthanne  chimique  Additif  Etude  expérimentale  Stabilité  Inflammabilité  Relation  mise  en  oeuvre  propriété  Polyaddition  Polycondensation  Matériau  revêtement  Retardateur  flamme  Phosphate  Préparation Index. décimale : 667.9 Revêtements et enduits Résumé : Three phosphorous functional groups were introduced in one structural unit of polymer backbone to enhance the flame retardancy of PU coatings. In the first step, we synthesized tetramethylene bis(orthophosphate) (TBOP) that contained two phosphorus functional groups in one structural unit. In the next step, we synthesized modified polyesters (ATBTP-10, -20, -30) that contained triphosphorous groups by condensing polymerization of TBOP, 1,4-butanediol, trimethylolpropane, adipic acid, and phenylphosphonic acid (PPA). The amount ofPPA in the ATBTPs was 10, 20, and 30 wt %. Then, flame-retardant PU coatings (AHFC-10, -20, -30) were prepared by curing ATBTPs with hexamethylene diisocyanate-biuret (curing agent) at room temperature. From the TGA analysis of diphosphorus-modified polyester (ATBT) and ATBTPs, the residues of ATBT, ATBTP-10, ATBTP-20, and ATBTP-30 were 24.6, 27.5, 29.2, and 31.9 %, respectively. From this result, it was found that the residue increased in relation to the amount of PPA. Physical properties of the films of flame-retardant coatings were deteriorated with the addition of PPA (flame retarding component), however, all the films of flame-retardant coatings, except AHFC-30, met the required physical properties standard for coatings. Char lengths of the AHFCs measured by the 45° Meckel burner method were 2.9 ~ 4.8 cm, and LOI values were 28 ~ 31 %, which indicates that the prepared AHFCs showed good flame retardancy. DOI : 10.1007/s11998-006-0005-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0005-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3720 [article]

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