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Layer-by-layer-assembled chitosan/phosphorylated cellulose nanofibrils as a bio-based and flame protecting nano-exoskeleton on PU foams
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0003-4108-2279
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: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 202, p. 479-487Article in journal (Refereed) Published
Abstract [en]

The layer-by-layer (LbL) assembly of chitosan (CH) and phosphorylated cellulose nanofibrils (P-CNF) is presented as a novel, sustainable and efficient fire protection system for polyurethane foams. The assembly yields a linearly growing coating where P-CNF is the main component and is embedded in a continuous CH matrix. This CH/P-CNF system homogenously coats the complex 3D structure of the foam producing a nano-exoskeleton that displays excellent mechanical properties increasing the modulus of the foam while maintaining its ability of being cyclically deformed. During combustion the CH/P-CNF exoskeleton efficiently prevents foam collapse and suppresses melt dripping while reducing the heat release rate peak by 31% with only 8% of added weight. The coating behavior during combustion is investigated and correlated to the observed performances. Physical and chemical mechanisms are identified and related to the unique composition and structure of the coating imparted by the LbL assembly.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 202, p. 479-487
Keywords [en]
Chitosan, Flame retardancy, Layer-by-layer, Phosphorylated cellulose nanofibril, Polyurethane foams, Thermal stability, Cellulose, Coatings, Combustion, Fire protection, Nanofibers, Phosphorylation, Polyurethanes, Rigid foamed plastics, Thermodynamic stability, Cellulose nanofibrils, Fire protection system, Heat Release Rate (HRR), Layer by layer, Layer-by-layer assemblies, Nanofibril, Polyurethane Foam, Exoskeleton (Robotics)
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236545DOI: 10.1016/j.carbpol.2018.09.005ISI: 000446027100053PubMedID: 30287026Scopus ID: 2-s2.0-85053185952OAI: oai:DiVA.org:kth-236545DiVA, id: diva2:1266160
Note

QC 20181127

Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2020-03-09Bibliographically approved

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Ghanadpour, MaryamWågberg, Lars

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