Flame-Retardant Paper from Wood Fibers Functionalized via Layer-by-Layer Assembly
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
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.
layer-by-layer assembly, flame-retardant, thermal stability, wood fibers, chitosan, poly(vinylphosphonic acid)
IdentifiersURN: urn:nbn:se:kth:diva-177953DOI: 10.1021/acsami.5b08105ISI: 000363994700047PubMedID: 26457504ScopusID: 2-s2.0-84945892481OAI: oai:DiVA.org:kth-177953DiVA: diva2:876264
QC 201512032015-12-032015-11-302015-12-03Bibliographically approved