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Published in: Cellulose 3/2021

06-01-2021 | Original Research

Low permeable hydrophobic nanofibrilated cellulose films modified by dipping and heating processing technique

Authors: Gustavo de Souza, Mohamed Naceur Belgacem, Alessandro Gandini, Antonio José Felix Carvalho

Published in: Cellulose | Issue 3/2021

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Abstract

Nanofibrilated cellulose (NFC) films have potential to replace synthetic polymers as flexible films for packaging. However, NFC is hydrophilic and water acts as plasticizer decreasing the stiffness of the films and reducing its barrier effectiveness against water vapor and oxygen. Here we describe the surface modification of cellulose films with blocked diisocyanates through a dipping and heating process not requiring the previous drying of the materials. The reactions were conducted at 170 °C for a few minutes during which deblocking led to a new urethane bond formation with NFC surface hydroxyl groups, thus hydrophobizing the films. A remarkable enhancement in water repellent properties was confirmed by water contact angles higher than 110° and water vapor transmission rate (WVTR) of 40 g/m2 day, which is very low when compared to similar materials, representing a reduction of 74% with respect to the non- modified films.

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Appendix
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Literature
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Metadata
Title
Low permeable hydrophobic nanofibrilated cellulose films modified by dipping and heating processing technique
Authors
Gustavo de Souza
Mohamed Naceur Belgacem
Alessandro Gandini
Antonio José Felix Carvalho
Publication date
06-01-2021
Publisher
Springer Netherlands
Published in
Cellulose / Issue 3/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-020-03619-3

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