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Cellulose aerogel-based fiber reinforcement – towards thermoformable composite materials

Schestakow, Maria and Rege, Ameya Govind and Ratke, Lorenz (2022) Cellulose aerogel-based fiber reinforcement – towards thermoformable composite materials. 23. Symposium Verbundwerkstoffe und Werkstoffverbunde, 20.-22. Juli 2022, Hybrid Symposium Online und in Leoben, Austria.

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Abstract

Cellulose is renewable and characterized by a strong polymeric backbone. Thus, it is increasingly gaining attention as functional additive in polymers. Melt blending thermoplastic polymers with nanocellulose yields cellulose nanocomposites. However, nanocellulose particles tend to aggregate making a homogenious nanofiber distribution challenging.[1] Cellulose aerogels (CA) consist of a 3D randomnly arranged cellulose nanofibers and therefore isotropic by preparation. These open porous aerogels can be prepared by various routes that mostly involve the dissolution of the native cellulose (e.g. in aqueous salt hydrate melts such as ZnCl2) followed by regeneration and drying in supercritical CO2.[2] In order to overcome aggregation, cellulose aerogels can be used as a preformed nanofiber felt. By means of capillary force-assisted infusion molding of the pore structure with a thermoset matrix, light and faultless nanofiber-matrix composites are achieved. Such composites are called cellulose aerogel reinforced polymers (CARPs). CARPs having fiber fractions ranging from 6 to 22 vol.-% considerably affect the resulting mechanical properties and formability. Fiber fractions as low as 14 vol.-% yield composites with multiplied Youngs’ moduli observed with epoxy, phenolic and unsaturated polyester resins. Although, the composites were cured in a final processing step, CARPs show significant formability at elevated temperatures. The interface of CA and matrix combines friction, mechanical interlocking, and chemical fiber-matrix bonding yielding complete stress transmission and thus, joint deformation of both composite phases, the fiber and the matrix. In conclusion, CARPs appear as a single component material making it impossible to attribute the resulting properties to either the fiber or the matrix phases.

Item URL in elib:https://elib.dlr.de/187174/
Document Type:Conference or Workshop Item (Poster)
Title:Cellulose aerogel-based fiber reinforcement – towards thermoformable composite materials
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schestakow, Mariamaria.schestakow (at) dlr.dehttps://orcid.org/0000-0002-9392-8371
Rege, Ameya GovindAmeya.Rege (at) dlr.dehttps://orcid.org/0000-0001-9564-5482
Ratke, LorenzLorenz.Ratke (at) dlr.deUNSPECIFIED
Date:20 July 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Cellulose Aerogel Reinforced Polymers, Composites, Thermoforming
Event Title:23. Symposium Verbundwerkstoffe und Werkstoffverbunde
Event Location:Hybrid Symposium Online und in Leoben, Austria
Event Type:international Conference
Event Dates:20.-22. Juli 2022
Organizer:DGM
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement, V - NGC Fahrzeugstruktur II, L - Advanced Materials and New Manufacturing Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Schestakow, Maria
Deposited On:18 Aug 2022 08:13
Last Modified:18 Aug 2022 08:13

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