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On the combined use of UVA, HALS, photooxidation, and fracture energy measurements to anticipate the long-term weathering performance of clearcoat/basecoat automotive paint systems / J. L. Gerlock in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)
[article]
Titre : On the combined use of UVA, HALS, photooxidation, and fracture energy measurements to anticipate the long-term weathering performance of clearcoat/basecoat automotive paint systems Type de document : texte imprimé Auteurs : J. L. Gerlock, Auteur ; Mark E. Nichols, Auteur ; A. V. Kucherov, Auteur Année de publication : 2001 Article en page(s) : p. 45-54 Note générale : Bibliogr. Langues : Américain (ame) Tags : Industrie automobile Matériau revêtement Peinture Vernis Résistance intempérie Long terme Prévision Spectrométrie UV Absorption RPE IR Transformation Fourier Index. décimale : 667.9 Revêtements et enduits Résumé : Transmission UV spectroscopy measurements of clearcoat ultraviolet light absorber (UVA) disposition, electron spin resonance (ESR) spectroscopy measurements of clearcoat and basecoat Active hindered amine light stabilizer (HALS) disposition, and transmission Fourier transform infrared (FTIR) measurements of photooxidation have been carried out on 5 µm thick slices of clearcoat/basecoat/primer/e-coat paint systems on steel panels as a function of outdoor exposure. These analysis results are combined with clearcoat fracture energy measurements to assess the possibility that a clearcoat/basecoat paint system will resist catastrophic cracking/peeling failure at long times. Taken together, all results indicate that these non traditional paint weathering performance metrics should be added to the existing repertoire of paint weathering performance metrics to ensure that inferior clearcoat/basecoat automotive paint systems are not introduced into service. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5738
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 45-54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001226 - Périodique Bibliothèque principale Documentaires Disponible Spatially resolved degradation in heterophasic / Shulamith Schlick in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 5 (01/2005)
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Titre : Spatially resolved degradation in heterophasic Type de document : texte imprimé Auteurs : Shulamith Schlick, Auteur ; Krzysztof Kruczala, Auteur Année de publication : 2005 Article en page(s) : p. 389-397 Note générale : Bibliogr. Langues : Américain (ame) Tags : Tinuvin 770 Etude expérimentale Spectrométrie IR RPE Mécanisme réaction Stabilisation thermique Pipéridine dérivé Stabilisant chaleur Additif Relation formulation propriété Vieillissement Mélange hétérogène Propène polymère Caoutchouc éthylène propène thermoplastique Index. décimale : 667.9 Revêtements et enduits Résumé : Heterophasic propylene-ethylene copolymers (HPEC) containing bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (Tinuvin 770) as a hindered amine stabilizer (HAS) were thermally aged at 393 and 433 K. Two types of HPEC were examined, containing 25% and 10 % ethylene (E), respectively, as ethylene/propylene rubber (EPR). Electron spin resonance (ESR) spectra of nitroxide radicals in HPEC were studied in the temperature range 100-433 K ; the nitroxides were derived from the HAS and are termed HAS-NO. The results were compared with ESR spectra of the same radicals obtained first by oxidation of Tinuvin 770 and then were doped in HPEC and related homopolymers, polyethylene (PE) and polypropylene (PP) ; these nitroxides are termed spin probes. ESR spectra indicated that HAS-NO and the spin probes reside in a range of amorphous sites differing in their dynamic properties. The relative population of the sites was explained by assuming that the crystalline domains exert a restraining effect on chains located in vicinal amorphous domains. Spatial and temporal effects of the aging process were studied by ESR and ESR imaging (ESRI) of HAS-derived nitroxide radicals, and by FTIR of films prepared by compression molding. 1D ESRI enabled the visualization of an outer region of thickness 100 µm that contained a lower amount of nitroxides, and is believed to result from the loss of the stabilizer by diffusion (blooming) and possibly also in chemical reactions during aging. Two-dimensional spectral-spatial ESRI indicated the presence of nitroxide radicals in two amorphous sites, fast and slow ; the corresponding relative intensity varied with sample depth. Both ESRI and FTIR experiments suggested a faster degradation rate in HPEC containing 25 % E, as compared to 10 % E ; moreover, a larger Tinuvin 770 content in the polymers led to less efficient stabilization. FTIR spectra indicated increased ordering of polypropylene segments in HPEC during aging at 433 K. DOI : 10.1007/s11998-005-0006-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0006-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3728
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 5 (01/2005) . - p. 389-397[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000589 - Périodique Bibliothèque principale Documentaires Disponible