Title :

Epimerization and chain scission of polylactides in the presence of an organic base, TBD

Author(s) :

Meimoun, Julie [Auteur]
Huret, Audrey [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Bria, Marc [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Merle, Nicolas [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Stoclet, Gregory [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
De Winter, Julien [Auteur]
Mincheva, Rosica [Auteur]
Raquez, Jean-Marie [Auteur]
Zinck, Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Journal title :

Polymer Degradation and Stability

Volume number :

181

Publisher :

Elsevier BV

Publication date :

2020-11

ISSN :

0141-3910

English keyword(s) :

Polylactide
Epimerization
Racemization
Organocatalysis
Chain scission
Plastic recycling

HAL domain(s) :

Chimie/Polymères

English abstract : [en]

The epimerization of polylactide is reported in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) at 105°C in toluene. The extent of the reaction depends on the amount of TBD ...
Show more >The epimerization of polylactide is reported in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) at 105°C in toluene. The extent of the reaction depends on the amount of TBD introduced and the reaction time. Up to ca. 46% D units can be formed starting from poly(L-lactide) in the presence of 5 mol% TBD. The epimerization rate is slightly higher for D-stereoisomers vs. L-stereoisomers. From the decrease of the number-average molecular weight observed, a concomitant chain scission reaction is observed. A possible mechanism based on a nucleophilic attack of TBD is proposed based on NMR analyses, notably DOSY, MALDI ToF mass spectrometry and IR spectroscopy. The implications of the work in the field of polymer synthesis and chemical recycling of polylactide are discussed.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Catalyse et synthèse éco-compatible (CASECO)

Submission date :

2021-05-20T13:07:51Z
2021-06-03T07:18:15Z
2021-06-03T07:22:06Z
2021-06-03T07:54:01Z
2022-08-23T15:13:43Z