Wet-spinning of cellulose nanofibril hydrogels

Research output: ThesisDoctoral ThesisCollection of Articles

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Wet-spinning of cellulose nanofibril hydrogels. / Lundahl, Meri.

Aalto University, 2018. 183 p.

Research output: ThesisDoctoral ThesisCollection of Articles

Harvard

Lundahl, M 2018, 'Wet-spinning of cellulose nanofibril hydrogels', Doctor's degree, Aalto University.

APA

Vancouver

Lundahl M. Wet-spinning of cellulose nanofibril hydrogels. Aalto University, 2018. 183 p. (Aalto University publication series DOCTORAL DISSERTATIONS; 211).

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@phdthesis{5135842e8bde4300bcdc5b58412be399,
title = "Wet-spinning of cellulose nanofibril hydrogels",
abstract = "Filaments were produced from cellulose nanofibrils (CNF) through wet-spinning for developments toward renewable fibre-based materials, such as absorbents or fibre-reinforced composites. The possibility to spin long filaments (i.e., spinnability) and resulting filament quality were related with the rheological behaviour of the CNF hydrogels used as precursors. A prototype wet-spinning line was developed for high-throughput filament production by co-extrusion with a supporting biopolymer shell around the CNF core. This system was also employed to spin absorbent filaments from CNF in combination with a shell that had limited compatibility with cellulose and coagulated effectively in aqueous media. The moisture sorption capacity was also increased by increasing the CNF surface charge, which also enhanced fibril alignment during filament formation. Filament mechanical integrity in wet conditions was improved through hydrophobic coating and interfibrillar crosslinking. The results highlight the use of wet-spinning as a simple and versatile approach to generate tuneable filaments from cellulose, an abundant bioresource. This will eventually enable the adoption of renewable options in applications that currently rely on fibres made from fossil carbon.",
keywords = "nanocellulose, wet-spinning, rheology, hydrogel, filament, water absorbency, nanoselluloosa, m{\"a}rk{\"a}kehr{\"a}ys, reologia, hydrogeeli, filamentti, veden imukyky, nanocellulose, wet-spinning, rheology, hydrogel, filament, water absorbency",
author = "Meri Lundahl",
year = "2018",
language = "English",
isbn = "978-952-60-8265-3",
series = "Aalto University publication series DOCTORAL DISSERTATIONS",
publisher = "Aalto University",
number = "211",
school = "Aalto University",

}

RIS - Download

TY - THES

T1 - Wet-spinning of cellulose nanofibril hydrogels

AU - Lundahl, Meri

PY - 2018

Y1 - 2018

N2 - Filaments were produced from cellulose nanofibrils (CNF) through wet-spinning for developments toward renewable fibre-based materials, such as absorbents or fibre-reinforced composites. The possibility to spin long filaments (i.e., spinnability) and resulting filament quality were related with the rheological behaviour of the CNF hydrogels used as precursors. A prototype wet-spinning line was developed for high-throughput filament production by co-extrusion with a supporting biopolymer shell around the CNF core. This system was also employed to spin absorbent filaments from CNF in combination with a shell that had limited compatibility with cellulose and coagulated effectively in aqueous media. The moisture sorption capacity was also increased by increasing the CNF surface charge, which also enhanced fibril alignment during filament formation. Filament mechanical integrity in wet conditions was improved through hydrophobic coating and interfibrillar crosslinking. The results highlight the use of wet-spinning as a simple and versatile approach to generate tuneable filaments from cellulose, an abundant bioresource. This will eventually enable the adoption of renewable options in applications that currently rely on fibres made from fossil carbon.

AB - Filaments were produced from cellulose nanofibrils (CNF) through wet-spinning for developments toward renewable fibre-based materials, such as absorbents or fibre-reinforced composites. The possibility to spin long filaments (i.e., spinnability) and resulting filament quality were related with the rheological behaviour of the CNF hydrogels used as precursors. A prototype wet-spinning line was developed for high-throughput filament production by co-extrusion with a supporting biopolymer shell around the CNF core. This system was also employed to spin absorbent filaments from CNF in combination with a shell that had limited compatibility with cellulose and coagulated effectively in aqueous media. The moisture sorption capacity was also increased by increasing the CNF surface charge, which also enhanced fibril alignment during filament formation. Filament mechanical integrity in wet conditions was improved through hydrophobic coating and interfibrillar crosslinking. The results highlight the use of wet-spinning as a simple and versatile approach to generate tuneable filaments from cellulose, an abundant bioresource. This will eventually enable the adoption of renewable options in applications that currently rely on fibres made from fossil carbon.

KW - nanocellulose

KW - wet-spinning

KW - rheology

KW - hydrogel

KW - filament

KW - water absorbency

KW - nanoselluloosa

KW - märkäkehräys

KW - reologia

KW - hydrogeeli

KW - filamentti

KW - veden imukyky

KW - nanocellulose

KW - wet-spinning

KW - rheology

KW - hydrogel

KW - filament

KW - water absorbency

M3 - Doctoral Thesis

SN - 978-952-60-8265-3

T3 - Aalto University publication series DOCTORAL DISSERTATIONS

PB - Aalto University

ER -

ID: 32029868