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Layer-by-Layer-Coated Cellulose Fibers Enable the Production of Porous, Flame-Retardant, and Lightweight Materials
Politecn Torino, Dipartimento Sci Applicata & Tecnol, I-15121 Alessandria, Italy..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.
Politecn Torino, Dipartimento Sci Applicata & Tecnol, I-15121 Alessandria, Italy..ORCID iD: 0000-0001-6472-1382
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-5444-7276
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2023 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 15, no 30, p. 36811-36821Article in journal (Refereed) Published
Abstract [en]

New sustainable materialsproduced by green processing routes arerequired in order to meet the concepts of circular economy. The replacementof insulating materials comprising flammable synthetic polymers bybio-based materials represents a potential opportunity to achievethis task. In this paper, low-density and flame-retardant (FR) porousfiber networks are prepared by assembling Layer-by-Layer (LbL)-functionalizedcellulose fibers by means of freeze-drying. The LbL coating, encompassingchitosan and sodium hexametaphosphate, enables the formation of aself-sustained porous structure by enhancing fiber-fiber interactionsduring the freeze-drying process. Fiber networks prepared from 3 Bi-Layer(BL)-coated fibers contain 80% wt of cellulose and can easily self-extinguishthe flame during flammability tests in vertical configuration whiledisplaying extremely low combustion rates in forced combustion tests.Smoke release is 1 order of magnitude lower than that of commerciallyavailable polyurethane foams. Such high FR efficiency is ascribedto the homogeneity of the deposited assembly, which produces a protectiveexoskeleton at the air/cellulose interface. The results reported inthis paper represent an excellent opportunity for the developmentof fire-safe materials, encompassing natural components where sustainabilityand performance are maximized.

Place, publisher, year, edition, pages
American Chemical Society (ACS) , 2023. Vol. 15, no 30, p. 36811-36821
Keywords [en]
cellulose, porous materials, layer-by-layer, flame-retardancy, lightweight materials
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:kth:diva-333805DOI: 10.1021/acsami.3c06652ISI: 001032189600001PubMedID: 37467121Scopus ID: 2-s2.0-85166442328OAI: oai:DiVA.org:kth-333805DiVA, id: diva2:1786998
Note

QC 20230810

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-08-10Bibliographically approved

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Zhao, MengxiaoPettersson, TorbjörnWågberg, Lars

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