A comparative study of the thermo-mechanical properties of polylactide/cellulose nanocrystal nanocomposites obtained by two surface compatibilization strategies
2021; Elsevier BV; Volume: 29; Linguagem: Inglês
10.1016/j.mtcomm.2021.102907
ISSN2352-4928
AutoresHajar Faraj, Cyrille Sollogoub, Alain Guinault, Matthieu Gervais, Julien Bras, Hanène Salmi-Mani, Philippe Roger, Manon Le Gars, Sandra Domenek,
Tópico(s)Nanocomposite Films for Food Packaging
ResumoNanocomposites of poly(lactide) (PLA) and cellulose nanocrystal (CNC) were fabricated using two different types of covalently grafted surface compatibilizers, namely fatty acids (lauric or stearic acid) and poly(glycidyl methacrylate) (PGMA) bearing reactive epoxy end-groups.Temperature-Modulated DSC analysis informed on weak attractive interaction of PLA and CNC-g-lauric acid and weak plasticizing of CNC-g-stearic acid.Despite that a homogenous dispersion of up to 50 wt.% of CNC in PLA was obtained and the rubbery elastic moduli increased 150-fold as compared to PLA.CNC-g-PGMA phase-separated in PLA but partially to it at the interface.It yielded a 40-fold increase of rubbery plateau moduli.The data analysis with the Ouali model for percolated systems and the Halpin-Tsai model for composites with short fibres showed that CNC-g-lauric acid percolated in PLA.However the effective modulus
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