期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 211, 期 -, 页码 626-638出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.05.050
关键词
Poly (lactic acid); Surface compatibilization; Functionalized nanocellulose; Cellulose Nanofibrils; Nanocomposite films; Grafting reaction; Surface tension; Modification strategy; NMR characterization
资金
- UBACyT [20020170100090BA]
- CONICET [PIP 112-2015-0100443CO]
- PolyNat Carnot Institut [ANR-11-CARN-030-01]
- LabEx Tec 21 [ANR-11-LABX-0030]
A chemical modification method was developed to modify the surface of cellulose nanofibrils (CNFs) from an ordinary bamboo. The modified CNFs were used as nano-fillers to improve the properties of films based on polylactic acid (PLA). The study showed that the addition of 5% modified CNFs resulted in improved thermal, mechanical, and surface properties of the films.
Chemical modification in surface of cellulose nanofibrils CNFs (20 nm) from an endemic and non-significant value-added, Argentine bamboo, was developed. The modification in the CNFs was carried out with three simple routes using a low molecular weight polylactic acid synthesized in our laboratory (PLA1). The first step comprises of protection of the hydroxyl groups of PLA1 through a benzoylation (PLA1Bz). The next step consisted of the activation of carboxyl groups using thionyl chloride and the last reaction was the grafting of the modified PLA onto the CNFs (PLA1Bz-g-CNF). The covalently functionalization is confirmed by spectroscopically techniques as well as PLA1Bz-g-CNFs were characterized by thermal analyses. The PLA1Bz-g-CNFs were taken up such as nanocharges to improve properties of compatibilization and changing surface properties in films based on PLA. The comparison between the films with PLA1Bz-g-CNFs with respect to the physic mixture of the components (PLA1Bz/CNF), shows an improvement in the thermal, mechanical, and surface properties of the material, particularly when 5% of PLA1Bz-g-CNFs was added. The dispersive (gamma S D) component of film is increased in 36.1 mN/m respect to 29.3 mN/m from the films obtained with the physic mixture nanofibrils without modification and a plasticizing effect was noticed in the final material.
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