Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly (lactide)
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Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly (lactide)

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Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly (lactide)

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dc.contributor.author Badia Valiente, José David
dc.contributor.author Strömberg, E.
dc.contributor.author Ribes Greus, A.
dc.contributor.author Karlsson, S.
dc.date.accessioned 2020-12-15T16:33:48Z
dc.date.available 2020-12-15T16:33:48Z
dc.date.issued 2011
dc.identifier.uri https://hdl.handle.net/10550/76683
dc.description.abstract Multiple processing by means of successive injection cycles was used to simulate the thermo-mechanical degradation effects on the oligomeric distribution of PLA under mechanical recycling. Likewise, an accelerated thermal ageing over PLA glass transition was performed in order to simulate its service life. MALDI-TOF MS was used for the analysis and the sample preparation procedure was assessed by means of a statistical Design of Experiments (DoE). The quality effects in use for the analysis were signal-to-noise ratio and Resolution. Different matrixes, analyte/matrix proportions and the use of NaTFA as cationization agent were considered. A deep inspection of the statistical results provided a better understanding of the influence of the different factors, individually or in combination, to the signal. The application of DoE for the improvement of the MALDI measurement of PLA stated that the best combination of factors (levels) was the following: matrix (s-DHB), proportion analyte/matrix (1/5 V/V), and no use of cationization agent. Degradation primarily affected the initially predominant cyclic [LAC]n and linear H[LAL]nOH species, where LA stands for a PLA repeating unit. Intramolecular and intermolecular transesterifications as well as hydrolytic and homolytic reactions took place during the formation and disappearance of oligomeric species. In both degradation mechanisms induced by thermal ageing and thermo-mechanical degradation, the formation of H[LAL]nOCH3 by intermolecular transesterifications was highlighted.
dc.language.iso eng
dc.relation.ispartof European Polymer Journal, 2011, vol. 47, num. 7, p. 1416-1428
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Badia Valiente, José David Strömberg, E. Ribes Greus, A. Karlsson, S. 2011 Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly (lactide) European Polymer Journal 47 7 1416 1428
dc.subject Termoplàstics
dc.subject Solucions polimèriques
dc.title Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly (lactide)
dc.type info:eu-repo/semantics/article
dc.date.updated 2020-12-15T16:33:49Z
dc.identifier.doi https://doi.org/10.1016/j.eurpolymj.2011.05.001
dc.identifier.idgrec 134912

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