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Flexibilisation of Resorcinol-Formaldehyde Aerogels

Schwan, Marina and Ratke, Lorenz (2013) Flexibilisation of Resorcinol-Formaldehyde Aerogels. Journal of Materials Chemistry A (1), pp. 13462-13468. Royal Society of Chemistry. doi: 10.1039/c3ta13172f. ISSN 2050-7488.

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Official URL: http://www.rsc.org/MaterialsA

Abstract

Ambient pressure dried resorcinol - formaldehyde (RF) organic aerogels are usually hard and brittle with Young’s-moduli in the range of 1-2 MPa, strengths of about 100 kPa and densities in the range of 0.2 to 0.4 g cm-3. Modification of the classical sol-gel synthesis route transforms these brittle materials into rubber- or cork-like flexible aerogels. We observed that in a small window of process parameters, the aerogel density decreases by an order of magnitude as well as the Young’s moduli and the compression strengths. These new type of RF aerogels are elastically deformable by more than 40 % in an almost reversible manner. In this paper we describe the effects of various sol-gel parameters on the flexibility, such as resorcinol to water and catalyst molar ratio and the pH of the initial solution. The aerogels are characterized with respect to envelope density, stress-strain behavior and microstructure as observed by SEM fractographs. The chemical structure and structural differences arising between brittle and flexible RF aerogels were studied by recording 13C-NMR spectra.

Item URL in elib:https://elib.dlr.de/84802/
Document Type:Article
Title:Flexibilisation of Resorcinol-Formaldehyde Aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schwan, MarinaUNSPECIFIEDUNSPECIFIED
Ratke, LorenzUNSPECIFIEDUNSPECIFIED
Date:September 2013
Journal or Publication Title:Journal of Materials Chemistry A
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1039/c3ta13172f
Page Range:pp. 13462-13468
Publisher:Royal Society of Chemistry
ISSN:2050-7488
Status:Published
Keywords:aerogel, polymer, resol, flexibility
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Project Neuartige Fahrzeugkonzepte und -strukturen (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Schwan, Marina
Deposited On:23 Oct 2013 08:18
Last Modified:06 Sep 2019 15:30

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