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@PHDTHESIS{Schestakow:812327,
author = {Schestakow, Maria},
othercontributors = {Ratke, Lorenz and Raabe, Dierk and Bührig-Polaczek,
Andreas},
title = {{N}anostrukturierte
{C}ellulose-{A}erogel-{P}olyesterverbunde},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2021-01813},
pages = {1 Online-Ressource (iii, 110 Seiten) : Illustrationen,
Diagramme},
year = {2020},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2021; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2020},
abstract = {The mechanically stable nature of cellulose makes it
potentially suitable for the reinforcement of polymers. In
dissolving the initial cellulose in an aqueous zinc chloride
salt hydrate melt it is shaped into a desired form,
regenerated, washed, and dried in supercritical CO2 to yield
Cellulose-Aerogel (CA) sheets. The aerogel offers a three
dimensional network of open porous and thus well accessible
cellulose fibrils of 7-25 nm in diameter and lengths of
several 100 nm. That randomly arranged nano fibrous felt
serves as a predefined network that can be infused by a
suitable matrix system to achieve Cellulose-Aerogel
Reinforced Polymers(CARPs). The air contained in the aerogel
is replaced by capillary assisted infusion with an
unsaturated polyester resins for the matrix system to give
outstanding composite materials. The density of these
composites is found to be only slightly above that of the
thermoset itself, since only 6-22 $vol.\%$ of fiber
reinforcement already has an impact. Mechanical testing
using impulse excitation, dynamic mechanical analysis,
tensile, and 3-point bending reveal significant improvement
by multiplication of the Young’s modulus with respect to
the reference thermoset. Furthermore, the incorporation of
the cellulose network allows for substantially altered
deformation mechanisms yielding shear fracture in CARPs and
cleavage fracture in CA. Apart from the strong frequence
dependency enormous breaking elongations (>20 $\%)$ are
observed. Digital image correlation is used to follow local
deformation and SEM investigations depict the effect of the
Cellulose-Aerogel on the strain behaviour of the final
composite material. The strong dependency on the strain rate
and the inability of necking leads to the conclusion of
CARPs being superplastic materials. As a result, the
predefined network of high strength cellulose fibrils can
very well serve as a renewable fiber reinforcement for
polymers (FRP) utilizing its full potential to yield high
performance polymer composites.},
cin = {523110 / 520000 / 526110},
ddc = {620},
cid = {$I:(DE-82)523110_20140620$ / $I:(DE-82)520000_20140620$ /
$I:(DE-82)526110_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2021-01813},
url = {https://publications.rwth-aachen.de/record/812327},
}
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