A statistical design of experiments for optimizing the MALDI-TOF-MS sample preparation of polymers. An application in the assessment of the thermo-mechanical degradation mechanisms of poly (ethylene terephthalate).

6533b7d1fe1ef96bd125d8c6

RESEARCH PRODUCT

A statistical design of experiments for optimizing the MALDI-TOF-MS sample preparation of polymers. An application in the assessment of the thermo-mechanical degradation mechanisms of poly (ethylene terephthalate).

Amparo Ribes-greus José David Badia Emma Strömberg Sigbritt Karlsson

subject

Solucions polimèriques Ethylene Polymers Analytical chemistry Degradation kinetics Biochemistry Thermo-mechanical degradation Sample preparation procedure Analytical Chemistry Matrix (chemical analysis)chemistry.chemical_compound Degradation Glycols Matrix assisted laser desorption ionization time of flight mass spectrometry Polyethylene terephthalate Mechanisms Cationization Sample preparation Recycling Mechanical recycling Spectroscopy Priority journal chemistry.chemical_classification Dithranol Signal to noise ratio Polyethylene terephthalate Hydrolysis Multiple processing Polymer Poly (ethylene terephthalate)Potential reactions Injection cycles MAQUINAS Y MOTORES TERMICOS Inductively coupled plasma Simulation Ethers Matrix-assisted laser desorption/ionization time-of-flight Quality parameters Design of Experiments Glycol units Sample preparation Article Ethylene Environmental Chemistry Polyethylene terephthalates MALDI TOF MS Signal noise ratio Mass spectrometry Matrix Termoplàstics Signal to noise Transesterification Degradation mechanism Matrix-assisted laser desorption/ionization Statistical design of experiments Transesterification chemistry Chemical engineering Oligomers Desorption Ethylene glycol Controlled study Process optimization

description

[EN] The sample preparation procedure for MALDI-TOF MS of polymers is addressed in this study by the application of a statistical Design of Experiments (DoE). Industrial poly (ethylene terephthalate) (PET) was chosen as model polymer. Different experimental settings (levels) for matrixes, analyte/matrix proportions and concentrations of cationization agent were considered. The quality parameters used for the analysis were signal-to-noise ratio and resolution. A closer inspection of the statistical results provided the study not only with the best combination of factors for the MALDI sample preparation, but also with 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 measure of PET stated that the best combination of factors and levels was the following: matrix (dithranol), proportion analyte/matrix/cationization agent (1/15/1, V/V/V), and concentration of cationization agent (2gL -1). In a second part, multiple processing by means of successive injection cycles was used to simulate the thermo-mechanical degradation effects on the oligomeric distribution of PET under mechanical recycling. The application of MALDI-TOF-MS showed that thermo-mechanical degradation primarily affected initially predominant cyclic species. Several degradation mechanisms were proposed, remarking intramolecular transesterification and hydrolysis. The ether links of the glycol unit in PET were shown to act as potential reaction sites, driving the main reactions of degradation. © 2011 Elsevier B.V.

year	journal	country	edition	language
2011-01-01	Analytica chimica acta

10.1016/j.aca.2011.02.063 https://pubmed.ncbi.nlm.nih.gov/21501716