Nowadays, sector of food packaging is turning to high performance biomaterials. Among bio-based materials produced from biomass, cellulose, one of the most abundant natural polymers, is a semi crystalline polymer with a microfibrillar structure. Since the last decades, interest on cellulosic materials has increased with its use as nanostructured materials, either in the form of cellulose nanocrystals (CNC) or cellulose micro/nanofibrils (CNF) . Indeed such nanocellulose are very good reinforcing materials and could also help in barrier properties. One drawback is their compatibility with classic polymer matrices used in packaging. The aim of this work is to functionalize CNC for the design of new active packaging.<br/>Firstly, CNC are modified with the esterification SolReact process, in order to introduce reactive ethylene moieties at their surface. Chemical grafting is proved by direct methods (FTIR, NMR, Elemental Analysis). Secondly, these modified CNC are grafted from with Poly(glycidyl methacrylate) (PGMA), in order to improve their compatibility in a polylactic acid (PLA) matrix. Moreover, in order to understand the influence of the degree of polymerization (DP) of PGMA, two polymerizations with two different DP of PGMA have been carried out. Finally, polymerized CNC are characterized by FTIR, size exclusion chromatography, TEM and contact angle. Their compatibility is studied after their incorporation in PLA films. Proofs of the different graftings and polymerizations have been highlighted and such biomaterials have been successfully designed for developing new active packaging.<br/>

Cellulose nanocrystals grafted with Poly(glycidyl methacrylate) for their compatibilization in nanocomposites

255th National Meeting (2018)

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