Publication:
Dynamically bonded cellulose nanocrystal hydrogels: structure, rheology and fire prevention performance

dc.contributor.coauthorKaynak-Uraz, Elif
dc.contributor.departmentDepartment of Chemical and Biological Engineering
dc.contributor.departmentGraduate School of Sciences and Engineering
dc.contributor.departmentKUBAM (Koç University Boron and Advanced Materials Application and Research Center)
dc.contributor.departmentKUYTAM (Koç University Surface Science and Technology Center)
dc.contributor.kuauthorKoparipek, Nazlınur Arslan
dc.contributor.kuauthorŞenses, Erkan
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.contributor.schoolcollegeinstituteGRADUATE SCHOOL OF SCIENCES AND ENGINEERING
dc.contributor.schoolcollegeinstituteResearch Center
dc.date.accessioned2024-12-29T09:36:45Z
dc.date.issued2024
dc.description.abstractFlame retardant composite hydrogels offer many advantages over conventional flame retardants, such as high water-retention capacity, enhanced fire resistance, and mechanical tunability. Herein, we developed flame-retardant dynamic covalent hydrogels using wood-derived cellulose nanocrystals (CNCs) crosslinked with boronate ester bonds, addressing environmental and health issues associated with the presence of non-biodegradable synthetic polymer and/or inorganic nanoparticle components in the existing systems. Our rheological investigation shows a liquid-to-soft-solid transition of CNC dispersions with tunable network elasticity ranging between ≈ 0.2 kPa to 3.5 kPa and an immediate self-healing ability. Coating pine wood with these hydrogels delayed ignition by about 30 s compared to native wood, and achieved a remarkable limiting oxygen index of 64.5 %. Also, the increased borax content of the gels was found to decrease and delay the first peak of the heat release rate up to 40 s, causing an increase in the fire retardancy index by 277 %. We correlate the microstructure and rheological behavior with the fire prevention mechanisms for the rational design of sustainable fire-retardant materials, and the results showcased a circular use of plant-based dynamic gels to prevent wood fires, even after drying- a feature lacking in conventional hydrogels.
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.indexedbyPubMed
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuTÜBİTAK
dc.description.sponsorshipThis work is supported by 1001 Program of The Scientific and Technological Research Council of Turkey (TÜBİTAK) (Grant no: 222Z106). We thank Dr. Barış Yağci of Koc University Surface Science and Technology Center (KUYTAM) for his help with SEM images, and Assoc. Prof. Rana Özbal for giving access to their polarized optical microscopy. The authors also thank Gürdeniz Neşer for his assistance with the vertical flame tests.
dc.description.volume334
dc.identifier.doi10.1016/j.carbpol.2024.122013
dc.identifier.eissn1879-1344
dc.identifier.issn0144-8617
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-85188088482
dc.identifier.urihttps://doi.org/10.1016/j.carbpol.2024.122013
dc.identifier.urihttps://hdl.handle.net/20.500.14288/22155
dc.identifier.wos1219343300001
dc.keywordsBorax
dc.keywordsBoron ester
dc.keywordsCellulose nanocrystals (CNC)
dc.keywordsDynamic covalent bond
dc.keywordsFlame-retardant
dc.keywordsHydrogel
dc.keywordsWildfire
dc.keywordsWood fire
dc.language.isoeng
dc.publisherElsevier Ltd
dc.relation.grantnoTürkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK, (222Z106)
dc.relation.grantnoTürkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK
dc.relation.ispartofCarbohydrate Polymers
dc.subjectChemistry, polymer science
dc.titleDynamically bonded cellulose nanocrystal hydrogels: structure, rheology and fire prevention performance
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorŞenses, Erkan
local.contributor.kuauthorKoparipek, Nazlınur Arslan
local.publication.orgunit1College of Engineering
local.publication.orgunit1GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
local.publication.orgunit1Research Center
local.publication.orgunit2Department of Chemical and Biological Engineering
local.publication.orgunit2KUYTAM (Koç University Surface Science and Technology Center)
local.publication.orgunit2KUBAM (Koç University Boron and Advanced Materials Application and Research Center)
local.publication.orgunit2Graduate School of Sciences and Engineering
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