University of Oulu

Lakovaara, M., Sirviö, J.A., Sliz, R. et al. Modification of nanocellulose films in deep eutectic solvents using vinyl esters. Cellulose 29, 9073–9087 (2022).

Modification of nanocellulose films in deep eutectic solvents using vinyl esters

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Author: Lakovaara, Matias1; Sirviö, Juho Antti1; Sliz, Rafal2;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, Oulu, Finland
2Optoelectronics and Measurement Techniques Unit, University of Oulu, Oulu, Finland
3Faculty of Science, Masaryk University, Brno, Czech Republic
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.3 MB)
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Language: English
Published: Springer Nature, 2022
Publish Date: 2023-05-25


The hydrophilicity of nanocellulose materials mitigates their good mechanical and oxygen barrier properties when exposed to humid conditions. It also limits nanocellulose use in many applications where water is present. This study reveals hydrophobic modification of cellulose nanofiber (CNF) films with vinyl esters of variable alkyl chain length using deep eutectic solvent (DES) of imidazole and triethylmethylammonium chloride as a reaction medium. Additionally, the influence of ultraviolet-ozone (UV/O₃) pretreatment on CNF film modification in DES was addressed. The esterification of CNF films in DES was proven to be a simple and fast approach to increase the hydrophobicity of the films (increasing the contact angle from 38° to 107°), requiring only a 15 min reaction time and reaction temperature of 80 °C. Moreover, the modification improved water vapor barrier properties of the films and resulted in improved mechanical properties at wet state, especially with films treated with UV and ozone before modification.

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Series: Cellulose
ISSN: 0969-0239
ISSN-E: 1572-882X
ISSN-L: 0969-0239
Volume: 29
Issue: 17
Pages: 9073 - 9087
DOI: 10.1007/s10570-022-04840-y
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
221 Nanotechnology
216 Materials engineering
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