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Tailoring water stability of cellulose nanopaper by surface functionalization

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Abstract

Cellulose nanopaper (CNP) features appealing properties, including transparency, flatness, a low thermal expansion coefficient and thermal stability, often outperforming conventional paper. However, free-standing crystalline cellulose films usually swell in water or upon moisture sorption, compromising part of their outstanding properties. This remains a major problem whenever working in a water environment is required. Freestanding cellulose nanopaper is prepared by solution casting water suspensions of cellulose nanocrystals with an average width of 10 nm and an average aspect ratio of 28, isolated from Avicel by acid hydrolysis and extensively characterized by AFM and FE-SEM measurements and GPC detection of their degree of polymerization. We demonstrate by elemental analyses, FT-IR, Raman spectroscopy, XRD measurements and water contact angle detection that wet treatment with lauroyl chloride results in surface hydrophobization of nanopaper. The hydrophobized nanopaper, C12-CNP, shows a more compact surface morphology than the starting CNP, due to the effect of chemical functionalization, and presents enhanced resistance to water, as assessed by electrochemical permeation experiments. The new hydrophobized nanopaper is a promising substrate for thin film devices designed to work in a humid environment.

Graphical abstract: Tailoring water stability of cellulose nanopaper by surface functionalization

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Publication details

The article was received on 02 Mar 2018, accepted on 26 Aug 2018 and first published on 27 Aug 2018


Article type: Paper
DOI: 10.1039/C8SM00433A
Citation: Soft Matter, 2018, Advance Article
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    Tailoring water stability of cellulose nanopaper by surface functionalization

    A. Operamolla, S. Casalini, D. Console, L. Capodieci, F. Di Benedetto, G. V. Bianco and F. Babudri, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM00433A

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