Cellulose nanocrystals reinforced κ-carrageenan based UV resistant transparent bionanocomposite films for sustainable packaging applications

• Published in: Carbohydrate polymers 2019-05, Vol.211, p.181-194
• Main Authors: Yadav, Mithilesh, Chiu, Fang-Chyou
• Format: Article
• Language: English
• Subjects: Cellulose nanocrystal; Fourier-transform infrared spectral analysis; Mechanical property; Nanocomposite
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2019.01.114

•The κ-carrageenan/CNC films were synthesized by solution mixing blend technique.•Incorporation of CNC increased mechanical and barrier properties.•FTIR of κ-carrageenan/CNC showed an interaction between κ-carrageenan and CNC.•FESEM confirmed the excellent dispersion of CNCs in the κ-carrageenan matrix. In this work, κ-carrageenan bionanocomposite films were prepared by solution casting of a mixture of κ-carrageenan, glycerol, and various amounts of cellulose nanocrystals (CNCs, 0–9 wt.%). The structure and morphology of the bionanocomposite films were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Compared with κ-carrageenan films, the κ-carrageenan bionanocomposite films showed better mechanical and barrier properties (water and UV) and thermal stability. The water contact angle increased from 23.30° to 71.80° and the water vapor permeation decreased from 8.93 gm−1 s−1 Pa−1 to 4.69 × 10−11 gm−1 s−1 Pa−1 in the κ-carrageenan films loaded with 9–7 wt.% CNCs, respectively. The tensile strength and elongation at break of the films increased from 38.33 ± 3.79 MPa to 52.73 ± 0.70 MPa and from 21.50 ± 3.72% to 28.27 ± 2.39%, respectively, after CNC loading increased from 0 wt.% to 7.0 wt.%. These results indicated that the κ-carrageenan nanocomposite films have potential applications in food packaging.