Bitte benutzen Sie diese Kennung, um auf die Ressource zu verweisen:
https://doi.org/10.21256/zhaw-1553| Publikationstyp: | Beitrag in wissenschaftlicher Zeitschrift |
| Art der Begutachtung: | Peer review (Publikation) |
| Titel: | Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons |
| Autor/-in: | Badertscher, Remo Lerf, Reto Delfosse, Daniel Adlhart, Christian |
| DOI: | 10.21256/zhaw-1553 10.1016/j.polymdegradstab.2012.07.040 |
| Erschienen in: | Polymer Degradation and Stability |
| Band(Heft): | 97 |
| Heft: | 11 |
| Seite(n): | 2255 |
| Seiten bis: | 2261 |
| Erscheinungsdatum: | Nov-2012 |
| Verlag / Hrsg. Institution: | Elsevier |
| Verlag / Hrsg. Institution: | Amsterdam |
| ISSN: | 0141-3910 |
| Sprache: | Englisch |
| Schlagwörter: | Gamma irradiation; Antioxidant; Mechanism; Vitamin E |
| Fachgebiet (DDC): | 540: Chemie 620: Ingenieurwesen |
| Zusammenfassung: | Today, UHMWPE implants are stabilized with α-tocopherol and cross-linked by irradiation in order to reduce wear. Little is known about the structural transformation of the antioxidant α-tocopherol upon irradiation. In the present investigation, the major irradiation reaction products of α-tocopherol dissolved at 0.1 wt.% in liquid model hydrocarbons were characterized spectroscopically and by independent synthesis. We observed only a single product group, namely phenolic alkyl ethers formed by radical recombination of a phenoxyl radical with a secondary alkyl radical. The irradiation dose is the parameter which controls the amount of consumption of α-tocopherol. At a dose of 27.5 kGy, 31-34% of α-tocopherol was transformed into the corresponding ether, while at 97.9 kGy, the degree of transformation was 68-76%. The observed ether formation in the liquid model hydrocarbons explains two significant observations for the α-tocopherol stabilized polymers, namely depletion of the α-tocopherol’s phenol group upon irradiation and “grafting”, i.e. formation of a chemical bond between the polymer and its antioxidant. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/2079 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | Lizenz gemäss Verlagsvertrag |
| Departement: | Life Sciences und Facility Management |
| Organisationseinheit: | Institut für Chemie und Biotechnologie (ICBT) |
| Enthalten in den Sammlungen: | Publikationen Life Sciences und Facility Management |
Dateien zu dieser Ressource:
| Datei | Beschreibung | Größe | Format | |
|---|---|---|---|---|
| 2012_Adlhart_Grafting_of_Tocopherol_upon_Irradiation_Polymer_Degradation_and_Stability.pdf | 282.27 kB | Adobe PDF |  Öffnen/Anzeigen |
Zur Langanzeige
Badertscher, R., Lerf, R., Delfosse, D., & Adlhart, C. (2012). Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons. Polymer Degradation and Stability, 97(11), 2255–2261. https://doi.org/10.21256/zhaw-1553
Badertscher, R. et al. (2012) ‘Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons’, Polymer Degradation and Stability, 97(11), pp. 2255–2261. Available at: https://doi.org/10.21256/zhaw-1553.
R. Badertscher, R. Lerf, D. Delfosse, and C. Adlhart, “Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons,” Polymer Degradation and Stability, vol. 97, no. 11, pp. 2255–2261, Nov. 2012, doi: 10.21256/zhaw-1553.
BADERTSCHER, Remo, Reto LERF, Daniel DELFOSSE und Christian ADLHART, 2012. Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons. Polymer Degradation and Stability. November 2012. Bd. 97, Nr. 11, S. 2255–2261. DOI 10.21256/zhaw-1553
Badertscher, Remo, Reto Lerf, Daniel Delfosse, and Christian Adlhart. 2012. “Grafting of α-Tocopherol upon γ-Irradiation in UHMWPE Probed by Model Hydrocarbons.” Polymer Degradation and Stability 97 (11): 2255–61. https://doi.org/10.21256/zhaw-1553.
Badertscher, Remo, et al. “Grafting of α-Tocopherol upon γ-Irradiation in UHMWPE Probed by Model Hydrocarbons.” Polymer Degradation and Stability, vol. 97, no. 11, Nov. 2012, pp. 2255–61, https://doi.org/10.21256/zhaw-1553.
Alle Ressourcen in diesem Repository sind urheberrechtlich geschützt, soweit nicht anderweitig angezeigt.