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Flame-Retardant Paper from Wood Fibers Functionalized via Layer-by-Layer Assembly
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
2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 42, 23750-23759 p.Article in journal (Refereed) Published
Abstract [en]

The highly flammable character of cellulose-rich fibers from wood limits their use in some advanced materials. To suppress the flammability and introduce flame-retardant properties to individual pulp fibers, we deposited nanometer thin films consisting of cationic chitosan (CH) and anionic poly(vinylphosphonic acid) (PVPA) on fibers using the layer-by-layer (LbL) technique. The buildup of the rnultilayer film was investigated in the presence and absence of salt (NaCl) using model cellulose surfaces and a quartz crystal microbalance technique. Fibers were then treated with the same strategy, and the treated fibers were used to prepare paper sheets. A horizontal flame test (HFT) and cone calorimetry were conducted to evaluate the combustion behavior of paper sheets as a function of the number of bilayers deposited on fibers. In HFT, paper made of fibers coated with 20 CH/PVPA bilayers (BL), self-extinguished the flame, while uncoated fibers were completely consumed. Scanning electron microscopy of charred paper after HFT revealed that a thin shell of the charred polymeric multilayer remained after the cellulose fibers had been completely oxidized. Cone calorimetry demonstrated that the phosphorus-containing thin films (20 BL is similar to 25 nm) reduced the peak heat release rate by 49%. This study identifies a unique and highly effective way to impart flame-retardant characteristic to pulp fibers and the papers made from these fibers.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2015. Vol. 7, no 42, 23750-23759 p.
Keyword [en]
layer-by-layer assembly, flame-retardant, thermal stability, wood fibers, chitosan, poly(vinylphosphonic acid)
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-177953DOI: 10.1021/acsami.5b08105ISI: 000363994700047PubMedID: 26457504Scopus ID: 2-s2.0-84945892481OAI: oai:DiVA.org:kth-177953DiVA: diva2:876264
Note

QC 20151203

Available from: 2015-12-03 Created: 2015-11-30 Last updated: 2017-12-01Bibliographically approved

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Wågberg, Lars

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