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Ultrastrong and flame-resistant freestanding films from nanocelluloses, self-assembled using a layer-by-layer approach
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8622-0386
2017 (English)In: Applied Materials Today, ISSN 2352-9407, Vol. 9, 229-239 p.Article in journal (Refereed) Published
Abstract [en]

Nanosized cellulose nanofibrils (CNF) prepared from phosphorylated pulp fibers (P-CNF) are combined with CNF prepared from aminated fibers (cationic CNF) through a layer-by-layer (LbL) assembly to prepare a freestanding, transparent all-cellulose film. It is shown that the thermal stability and flame-retardant properties of the all CNF film are significantly improved when phosphorylated CNF is combined with cationic fibrils in an LbL assembled structure. The freestanding films also show a tensile strength of 160 MPa and a Young's modulus of 9 GPa, placing it among strongest freestanding LbL films fabricated so far, showing large promise for the use of these types of ultrathin films in advanced applications. The LbL build-up of the cationic CNF/P-CNF multilayer film is carefully studied by quartz crystal microbalance with dissipation (QCM-D) and atomic force microscopy (AFM). Hydrophobized silicon substrates are used for the LbL deposition and it is shown that the (cationic CNF/P-CNF)300 film, 2.3 μm thick, can be easily detached from the substrate using tweezers. The thermal stability, combustion behavior and mechanical properties of the films are further studied by thermogravimetric analysis, combustion and tensile tests respectively.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 9, 229-239 p.
Keyword [en]
Cationic CNF, Flame-retardant, Freestanding film, Layer-by-layer assembly, Phosphorylated CNF
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-218617DOI: 10.1016/j.apmt.2017.08.002ISI: 000417805400027Scopus ID: 2-s2.0-85028597729OAI: oai:DiVA.org:kth-218617DiVA: diva2:1161450
Funder
Swedish Foundation for Strategic Research
Note

QC 20171130

Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2018-01-12Bibliographically approved

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Wågberg, Lars

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