Structural and sorption properties of bio-nanocomposite films based on κ-carrageenan and cellulose nanocrystals

Popescu, Maria-Cristina; Dogaru, Bianca-Ioana; Sun, Dongyang; Stoleru, Elena; Simionescu, Bogdan C.

Abstract

There is an increased interest on changing the synthetic based materials to biodegradable ones, especially with natural polymers, polysaccharides or proteins. In this research we prepared bio-nanocomposite formulations with different component concentrations and investigated their structural features, with focus on the interactions, sorption properties, and how the combination between them influences these properties. By infrared spectroscopy, principal component analysis (PCA) and two-dimensional correlation spectroscopy (2DCOS) was identified that in the blending process are involved the −SO4 and C(4)-O-S groups of β-d-galactose, CO groups, (O=S=O) of carrageenan and –OH and CO groups from CNCs.

The water uptake and water sorption properties decrease with increasing the CNCs content in the formulations from about 15% for κ to 10% for κC15 and from about 128% for κ to 115% for κC15, respectively. The increase of the CNCs content induced an increase of the water contact angle from 47° for κ to 90° for κC15, indicating once again the involvement of the free hydroxyl groups in the hydrogen bonded interactions.

Citation

Popescu, M., Dogaru, B., Sun, D., Stoleru, E., & Simionescu, B. C. (2019). Structural and sorption properties of bio-nanocomposite films based on κ-carrageenan and cellulose nanocrystals. International Journal of Biological Macromolecules, 135, 462-471. https://doi.org/10.1016/j.ijbiomac.2019.05.194

• Journal Article Type: Article
• Acceptance Date: May 26, 2019
• Online Publication Date: May 28, 2019
• Publication Date: Aug 15, 2019
• Deposit Date: Jun 11, 2019
• Publicly Available Date: May 29, 2020
• Journal: International Journal of Biological Macromolecules
• Print ISSN: 0141-8130
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 135
• Pages: 462-471
• DOI: https://doi.org/10.1016/j.ijbiomac.2019.05.194
• Keywords: Biochemistry; Molecular Biology; Structural Biology; General Medicine
• Public URL: http://researchrepository.napier.ac.uk/Output/1868081
• Contract Date: Jun 19, 2019