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Surface Structuring and Water Interactions of Nanocellulose Filaments Modified with Organosilanes toward Wearable Materials
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2018 (English)In: ACS APPLIED NANO MATERIALS, ISSN 2574-0970, Vol. 1, no 9, p. 5279-5288Article in journal (Refereed) Published
Abstract [en]

Colloidal dispersions of cellulose nanofibrils (CNFs) are viable ternatives to cellulose II dissolutions used for filament spinning. e porosity and water vapor affinity of CNF filaments make them itable for controlled breathability. However, many textile plications also require water repellence. Here, we investigated the fects of postmodification of wet-spun CNF filaments via chemical vapor position (CVD). Two organosilanes with different numbers of methyl bstituents were considered. Various surface structures were achieved, ther as continuous, homogeneous coating layers or as ree-dimensional, hairy-like assemblies. Such surface features reduced e surface energy, which significantly affected the interactions with ter. Filaments with water contact angles of up to 116 were obtained, d surface energy measurements indicated the possibility of developing phiphobicity. Dynamic vapor sorption and full immersion experiments re carried out to inquire about the interactions with water, whether the liquid or gas forms. Mechanical tests revealed that the wet rength of the modified filaments were almost 3 times higher than that the unmodified precursors. The hydrolytic and mechanical stabilities the adsorbed layers were also revealed. Overall, our results shed ght on the transformation of aqueous dispersions of CNFs into laments that are suited for controlled interactions with water via ncurrent hydrolysis and condensation reactions in CVD, while intaining the moisture buffering capacity and breathability of related ructures.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 1, no 9, p. 5279-5288
Keywords [en]
cellulose nanofibrils, filaments, surface structuring, hydrophobization, organosilanes, chemical vapor deposition, wet spinning
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-248114DOI: 10.1021/acsanm.8b01268ISI: 000461401000094PubMedID: 30320301OAI: oai:DiVA.org:kth-248114DiVA, id: diva2:1307299
Note

QC 20190426

Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-04-26Bibliographically approved

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Ansari, Mohd Farhan
Polymer Chemistry

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CiteExportLink to record
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