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Characterization and laser-induced degradation of a medical grade polylactide

  • In this study, we carried out the structural and thermal characterization of a medical-grade poly (lactide) (PLA) by SEC, TGA, DSC, NMR, ICP-MS and Py-GC/MS. Moreover, we investigated the laser-induced degradation occurring when ultrashort laser pulses (ULP) were employed to cut extremely thin polymer films prepared by solvent-casting. ULP polymer cutting technology is an interesting manufacturing process for its advantages in potential medical applications. In fact, heat transmission to the region surrounding the cuts is limited, so that the incisions are precise and the effects on the regions around them are small. In this way, the need for post-processing is reduced and ULP cutting becomes interesting for industrial applications. However, degradation induced by ULP may occur and compromise the properties of the polymer samples. To investigate this possibility, portions of PLA films, ultrashort laser cut (ULC) and uncut, were analysed by SEC, DSC, NMR and FTIR. Furthermore, PLA oligomers were studied by ESI-MS. Both SEC and NMR showed a decrease in the molecular weight. FTIR, ESI-MS and NMR spectra revealed the presence of olefin end groups originated from a \beta-H transfer mechanism, induced by heat and/or light (Norrish II mechanism). Additionally, the inspection of the ESI mass spectra highlighted the cleavage of ester bonds related to the Norrish I type mechanism, undetected by the other techniques.

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Metadaten
Verfasserangaben:Paola Rizzarelli, Giovanni Piredda, Stefania La Carta, Emanuele Francesco Mirabella, Graziella Valenti, Ramona Bernet, Giuseppe Impallomeni
DOI:https://doi.org/10.1016/j.polymdegradstab.2019.108991
Titel des übergeordneten Werkes (Englisch):Polymer Degradation and Stability
Dokumentart:Wissenschaftlicher Artikel
Sprache:Englisch
Erscheinungsjahr:2019
Datum der Freischaltung:15.10.2019
Freies Schlagwort / Tag:Biodegradable polymers; Ultrashort pulses microfabrication
Jahrgang:o.Jg.
Ausgabe / Heft:Bd. 169/108991
Seitenanzahl:13
Organisationseinheit:Forschung / Forschungszentrum Mikrotechnik
DDC-Sachgruppen:500 Naturwissenschaften und Mathematik
600 Technik, Medizin, angewandte Wissenschaften
Open Access?:nein
Publikationslisten:Piredda, Giovanni
Lizenz (Deutsch):License LogoUrhG - Es gilt das Urheberrecht