Development of a novel pyrolysis-gas chromatography/mass spectrometry method for the analysis of poly(lactic acid) thermal degradation products

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Title: Development of a novel pyrolysis-gas chromatography/mass spectrometry method for the analysis of poly(lactic acid) thermal degradation products
Authors: Arrieta, Marina Patricia | Parres, Francisco | López, Juan | Jiménez, Alfonso
Research Group/s: Análisis de Polímeros y Nanomateriales
Center, Department or Service: Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología
Keywords: Poly(lactic acid) | Thermal degradation | Pyrolysis | Py-GC/MS | Logistic model | Boltzmann model
Knowledge Area: Química Analítica
Issue Date: May-2013
Publisher: Elsevier
Citation: Journal of Analytical and Applied Pyrolysis. 2013, 101: 150-155. doi:10.1016/j.jaap.2013.01.017
Abstract: Thermal degradation of PLA is a complex process since it comprises many simultaneous reactions. The use of analytical techniques, such as differential scanning calorimetry (DSC) and thermogravimetry (TGA), yields useful information but a more sensitive analytical technique would be necessary to identify and quantify the PLA degradation products. In this work the thermal degradation of PLA at high temperatures was studied by using a pyrolyzer coupled to a gas chromatograph with mass spectrometry detection (Py-GC/MS). Pyrolysis conditions (temperature and time) were optimized in order to obtain an adequate chromatographic separation of the compounds formed during heating. The best resolution of chromatographic peaks was obtained by pyrolyzing the material from room temperature to 600 °C during 0.5 s. These conditions allowed identifying and quantifying the major compounds produced during the PLA thermal degradation in inert atmosphere. The strategy followed to select these operation parameters was by using sequential pyrolysis based on the adaptation of mathematical models. By application of this strategy it was demonstrated that PLA is degraded at high temperatures by following a non-linear behaviour. The application of logistic and Boltzmann models leads to good fittings to the experimental results, despite the Boltzmann model provided the best approach to calculate the time at which 50% of PLA was degraded. In conclusion, the Boltzmann method can be applied as a tool for simulating the PLA thermal degradation.
Sponsor: This research was supported by the Ministry of Science and Innovation of Spain (MAT2011-28468-C02-02). Marina P. Arrieta thanks Generalitat Valenciana (Spain) for a Santiago Grisolía Grant (GRISOLIA/2011/007).
ISSN: 0165-2370 (Print) | 1873-250X (Online)
DOI: 10.1016/j.jaap.2013.01.017
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - NANOBIOPOL - Artículos de Revistas

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