Polymerization of glycidyl methacrylate from the surface of cellulose nanocrystals for the elaboration of PLA-based nanocomposites

•Controlled polymerization at the surface of activated cellulose nanocrystals.•High coverages are obtained : 40 up to 80 % in weight percentage of relative to CNCs.•Cellulose nanocrystals dispersion inversely related to the grafted polymer amount.•Improvement of the interface between polymerized CNC...

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Bibliographic Details
Published in:Carbohydrate polymers 2020-04, Vol.234, p.115899-115899, Article 115899
Main Authors: Le Gars, Manon, Bras, Julien, Salmi-Mani, Hanène, Ji, Marisol, Dragoe, Diana, Faraj, Hajar, Domenek, Sandra, Belgacem, Naceur, Roger, Philippe
Format: Article
Language:English
Subjects:
Cellulose nanocrystals
Chemical grafting
Chemical Sciences
Compatibilization
Engineering Sciences
Material chemistry
Materials
Poly(glycidyl methacrylate)
Poly(lactic acid)-based nanocomposites
Polymers
Surface-initiated atom transfer radical polymerization
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Summary:•Controlled polymerization at the surface of activated cellulose nanocrystals.•High coverages are obtained : 40 up to 80 % in weight percentage of relative to CNCs.•Cellulose nanocrystals dispersion inversely related to the grafted polymer amount.•Improvement of the interface between polymerized CNCs and poly(lactic acid) (PLA) matrix. Cellulose nanocrystals (CNCs) are used to design nanocomposites because of their high aspect ratio and their outstanding mechanical and barrier properties. However, the low compatibility of hydrophilic CNCs with hydrophobic polymers remains a barrier to their use in the nanocomposite field. To improve this compatibility, poly(glycidyl methacrylate) (PGMA) was grafted from CNCs containing α-bromoisobutyryl moieties via surface-initiated atom transfer radical polymerization. The novelty of this research is the use of a reactive epoxy-containing monomer that can serve as a new platform for further modifications or crosslinking. Polymer-grafted CNC-PGMA-Br prepared at different polymerization times were characterized by XRD, DLS, FTIR, XPS and elemental analysis. Approximately 40 % of the polymer at the surface of the CNCs was quantified after only 1 h of polymerization. Finally, nanocomposites prepared with 10 wt% CNC-PGMA-Br as nanofillers in a poly(lactic acid) (PLA) matrix exhibited an improvement in their compatibilization based on SEM observation.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2020.115899