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Tuning the Nanoscale Properties of Phosphorylated Cellulose Nanofibril-Based Thin Films to Achieve Highly Fire-Protecting Coatings for Flammable Solid Materials
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0001-8622-0386
2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 38, p. 32543-32555Article in journal (Refereed) Published
Abstract [en]

Ultrathin nanocomposite films were prepared by combining cellulose nanofibrils (CNFs) prepared from phosphorylated pulp fibers (P-CNF) with montmorillonite (MMT), sepiolite (Sep) clay, or sodium hexametaphosphate (SHMP). The flame-retardant and heat-protective capability of the prepared films as casings for a polyethylene (PE) film was investigated. Heating the coated PE in air revealed that the polymer film was thoroughly preserved up to at least 300 °C. The P-CNF/MMT coatings were also able to completely prevent the ignition of the PE film during cone calorimetry, but neither the P-CNF/Sep nor the P-CNF/SHMP coating could entirely prevent PE ignition. This was explained by the results from combined thermogravimetry Fourier transform infrared spectroscopy, which showed that the P-CNF/MMT film was able to delay the release of PE decomposition volatiles and shift its thermal degradation to a higher temperature. The superior flame-retardant performance of the P-CNF/MMT films is mainly attributed to the unique compositional and structural features of the film, where P-CNF is responsible for increasing the char formation, whereas the MMT platelets create excellent barrier and thermal shielding properties by forming inorganic lamellae within the P-CNF matrix. These films showed a tensile strength of 304 MPa and a Young's modulus of 15 GPa with 10 wt % clay so that this composite film was mechanically stronger than the previously prepared CNF/clay nanopapers containing the same amount of clay. 

Place, publisher, year, edition, pages
American Chemical Society , 2018. Vol. 10, no 38, p. 32543-32555
Keywords [en]
flame-retardant, nanocomposite, phosphorylated cellulose nanofibrils, thermal stability, thin film, Cellulose, Cellulose films, Coatings, Elastic moduli, Film preparation, Flame retardants, Flammable materials, Fourier transform infrared spectroscopy, Nanocomposites, Nanofibers, Phosphorylation, Polymer films, Semiconducting films, Sodium compounds, Tensile strength, Thermodynamic stability, Thermogravimetric analysis, Thin films, Ultrathin films, Cellulose nanofibrils, Cellulose nanofibrils (CNFs), Flammable solids, Montmorillonite (MMT), Nanoscale properties, Shielding properties, Sodium hexametaphosphate, Structural feature, Nanocomposite films
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236678DOI: 10.1021/acsami.8b10309ISI: 000446142100081PubMedID: 30148604Scopus ID: 2-s2.0-85053717985OAI: oai:DiVA.org:kth-236678DiVA, id: diva2:1262783
Funder
Swedish Foundation for Strategic Research , RMA11-0065
Note

Export Date: 22 October 2018; Article; Correspondence Address: Ghanadpour, M.; Department of Fiber and Polymer Technology, Department of Fiber and Polymer Technology, KTH Royal Institute of TechnologySweden; email: marygp@kth.se; Funding details: WWSC, Wallenberg Wood Science Center; Funding details: SSF, Stiftelsen för Strategisk Forskning; Funding details: RMA11-0065, SSF, Sjögren’s Syndrome Foundation; Funding text: The authors would like to acknowledge the Swedish Foundation for Strategic Research (SSF, grant number: RMA11-0065) for the financial support and L.W. also acknowledges the Wallenberg Wood Science Center for financial support.

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2020-03-09Bibliographically approved

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