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Enhancing strength and toughness of cellulose nanofibril network structures with an adhesive peptide
KTH, School of Biotechnology (BIO).
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: 0000-0003-0298-8553
KTH, School of Biotechnology (BIO).
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2018 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 181, p. 256-263Article in journal (Refereed) Published
Abstract [en]

The mechanical properties of cellulose nanofibrils network structure are essential for their applications in functional materials. In this work, an adhesive peptide consisting of just 11 amino acid residues with a hydrophobic core sequence of FLIVI (F – phenylalanine, L – leucine, I – isoleucine, V – valine) flanked by three lysine (K) residues was adsorbed to 2,2,6,6-Tetramethyl-1-piperidinyloxy radical (TEMPO) oxidized cellulose nanofibrils (TO-CNF). Composite films were prepared by solution casting from water suspensions of TO-CNF adsorbed with the adhesive peptide. The nanofibrils network structure of the composite was characterized by atomic force microscopy (AFM). The structure of the peptide in the composites and the interactions between TO-CNF and the peptide were studied by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The mechanical properties of the composites were characterized by tensile tests and dynamic mechanical analysis (DMA). With 6.3 wt.% adhesive peptide adsorbed onto TO-CNF, the composite showed a modulus of 12.5 ± 1.4 GPa, a tensile strength of 344.5 ± (15.3) MPa, and a strain to failure of 7.8 ± 0.4%, which are 34.4%, 48.8%, and 23.8% higher than those for neat TO-CNF, respectively. This resulted in significantly improved toughness (work to fracture) for the composite, 77% higher than that for the neat TO-CNF.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 181, p. 256-263
Keywords [en]
Adhesive peptide, Cellulose nanofibrils, Mechanical properties, Nanocomposite, Nanopaper structure
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-218914DOI: 10.1016/j.carbpol.2017.10.073ISI: 000418661000031PubMedID: 29253970Scopus ID: 2-s2.0-85032265249OAI: oai:DiVA.org:kth-218914DiVA, id: diva2:1161806
Note

QC 20171201

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

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Tang, HuHajian, AlirezaMeng, QijunBerglund, Lars A.Zhou, Qi
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