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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.citation	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.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.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	journal article	es_ES
dc.date.updated	2020-12-15T16:33:49Z
dc.identifier.doi	10.1016/j.eurpolymj.2011.05.001
dc.identifier.idgrec	134912
dc.rights.accessRights	open access	es_ES