Synthesis of a lignin polymer model consisting of only phenolic beta-O-4 linkages and testing its reactivity under alkaline conditions
GRELIER, Stéphane
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
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Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
GRELIER, Stéphane
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
HAM-PICHAVANT, Frédérique
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
< Réduire
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 2 LCPO : Biopolymers & Bio-sourced Polymers
Langue
en
Article de revue
Ce document a été publié dans
Holzforschung. 2009, vol. 63, n° 6, p. 681-689
De Gruyter
Résumé en anglais
A trimeric beta-O-4 lignin model bearing a styrene unit was polymerized in the presence of azobisisobutyronitrile as an initiator of free radical polymerization. The polymer analysis achieved by size exclusion chromatography ...Lire la suite >
A trimeric beta-O-4 lignin model bearing a styrene unit was polymerized in the presence of azobisisobutyronitrile as an initiator of free radical polymerization. The polymer analysis achieved by size exclusion chromatography (SEC), H-1, C-13, P-31 NMR, matrix-assisted laser desorption ionization combined with time-of-flight mass spectrometry (MALDI-ToF MS), differential scanning calorimetry, and thermogravimetry indicated its well-defined structure with good thermal stability at temperatures usually applied for alkaline pulping. SEC analysis proved a high degree of polymerization despite the size of the phenolic beta-O-4 units in the polymer structure. MALDI-ToF spectrometry indicated that the polymer is composed of phenolic beta-O-4 elements only. The chemical reactivity under alkaline conditions of the polymer was studied by both HPLC and P-31 NMR. These two methods revealed two main concurrent processes, which include an oxidation of the phenol part followed by C-alpha-C-beta bond cleavage, and formation of a quinone methide followed by its beta-O-4 bond cleavage.< Réduire
Mots clés en anglais
alkaline reactivity
lignin model
phenolic beta-O-4 unit
polymer
synthesis
Origine
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