Successful MALDI-MS Analysis of Synthetic Polymers with Labile End-Groups: The Case of Nitroxide-Mediated Polymerization Using the MAMA-SG1 Alkoxyamine - Aix-Marseille Université Accéder directement au contenu
Article Dans Une Revue Chemistry - A European Journal Année : 2012

Successful MALDI-MS Analysis of Synthetic Polymers with Labile End-Groups: The Case of Nitroxide-Mediated Polymerization Using the MAMA-SG1 Alkoxyamine

Résumé

A sample pretreatment was evaluated to enable the production of intact cationic species of synthetic polymers holding a labile end-group using matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. More specifically, polymers obtained by nitroxide-mediated polymerization involving the MAMA-SG1 alkoxyamine were stirred for a few hours in trifluoroacetic acid (TFA) to induce the substitution of a tert-butyl group on the nitrogen of nitroxide end-group by a hydrogen atom. Nuclear magnetic resonance, electrospray ionization tandem mass spectrometry, and theoretical calculations were combined to scrutinize this sample pretreatment from both mechanistic and energetic points of view. The substitution reaction was found to increase the dissociation energy of the fragile C?ON bond to a sufficient extent to prevent this bond to be spontaneously cleaved during MALDI analysis. This TFA treatment is shown to be very efficient regardless of the nature of the polymer, as evidenced by reliable MALDI mass spectrometric data obtained for poly(ethylene oxide), polystyrene and poly(butylacrylate).

Domaines

Chimie

Dates et versions

hal-01460353 , version 1 (07-02-2017)

Identifiants

Citer

Caroline Barrère, Christophe Chendo, Trang N. T. Phan, Valérie Monnier, Thomas Trimaille, et al.. Successful MALDI-MS Analysis of Synthetic Polymers with Labile End-Groups: The Case of Nitroxide-Mediated Polymerization Using the MAMA-SG1 Alkoxyamine. Chemistry - A European Journal, 2012, 18 (25), pp.7916-7924. ⟨10.1002/chem.201200239⟩. ⟨hal-01460353⟩
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