| 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 : |
Pdf |
| 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
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