Solvent Welding and Imprinting Cellulose Nanofiber Films Using Ionic Liquids

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Reyes , G , Borghei , M , King , A W T , Lahti , J & Rojas , O J 2019 , ' Solvent Welding and Imprinting Cellulose Nanofiber Films Using Ionic Liquids ' , Biomacromolecules , vol. 20 , no. 1 , pp. 502–514 . https://doi.org/10.1021/acs.biomac.8b01554

Title: Solvent Welding and Imprinting Cellulose Nanofiber Films Using Ionic Liquids
Author: Reyes, Guillermo; Borghei, Maryam; King, Alistair W. T.; Lahti, Johanna; Rojas, Orlando J.
Contributor: University of Helsinki, Department of Chemistry
Date: 2019-01
Language: eng
Number of pages: 13
Belongs to series: Biomacromolecules
ISSN: 1525-7797
URI: http://hdl.handle.net/10138/307403
Abstract: Cellulose nanofiber films (CNFF) were treated via a welding process using ionic liquids (ILs). Acid base-conjugated ILs derived from 1,5-diazabicyclo[4.3.0]non-5-ene [DBN] and 1-ethyl-3-methylimidazolium acetate ([emim][OAc]) were utilized. The removal efficiency of ILs from welded CNFF was assessed using liquid-state nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared spectroscopy (FTIR). The mechanical and physical properties of CNFF indicated surface plasticization of CNFF, which improved transparency. Upon treatment, the average CNFF toughness increased by 27%, and the films reached a Young's modulus of similar to 5.8 GPa. These first attempts for IL "welding" show promise to tune the surfaces of biobased films, expanding the scope of properties for the production of new biobased materials in a green chemistry context. The results of this work are highly relevant to the fabrication of CNFFs using ionic liquids and related solvents.
Subject: NANOCELLULOSE FILMS
MECHANICAL-PROPERTIES
DISSOLUTION
WATER
TOXICITY
COATINGS
BEHAVIOR
PAPER
FTIR
116 Chemical sciences
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