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Effective thermal insulation with aerogel-aerogel composites

Laskowski, Jessica and Milow, Barbara and Ratke, Lorenz (2014) Effective thermal insulation with aerogel-aerogel composites. Leibniz Young Polymer Scientist Forum, 27.-28. Aug. 2014, Aachen.

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Abstract

Aerogels are suitable to be used as thermal insulation material for example in vehicles or in building construction as they are highly porous (up to 99%), nanostructured and therefore have a low density (0.01-0.3 g/cm³) and a low thermal conductivity (< 0.03 W/m.K). In order to improve the handling we fixed highly insulating granular silica aerogel (SiO2) fabricated by industry with resorcinol-formaldehyde (RF) aerogel. RF is an organic aerogel synthesized via a sol-gel reaction of resorcinol (R, 1,3-dihydroxybenzene) and formaldehyde (F) in deionized water (W) with Na2CO3 as the catalyst (C). The molecules undergo an electrophilic aromatic substitution followed by a condensation reaction and form a sol which builds a three-dimensional network. The molar ratios used for RF are R/F = 0.7, R/W = 0.04 and R/C = 1500 leading to a less sensitive RF-aerogel. The composite aerogel is prepared by mixing the hydrophobic granular silica aerogel into the already highly viscous RF-solution. After gelation and aging, the gel can finally be dried under ambient conditions. Plates in the dimension of 21 x 21 x 8 cm³ are obtained in which the volume content, grain size and grain size distribution of granular silica aerogel influence the properties of the latter material. Composites have density between 0.18-0.23 g/cm³ and thermal conductivity at room temperature between 0.027-0.034 W/m.K. According to thermal analysis composites are suitable for thermal insulation in a normal temperature range lower than the decomposition temperature of 250 °C.

Item URL in elib:https://elib.dlr.de/90890/
Document Type:Conference or Workshop Item (Speech, Poster)
Additional Information:nicht referiert
Title:Effective thermal insulation with aerogel-aerogel composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laskowski, Jessicajessica.laskowski (at) dlr.deUNSPECIFIED
Milow, BarbaraBarbara.Milow (at) dlr.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.deUNSPECIFIED
Date:August 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:aerogel-aerogel composite, resorcinol-formaldehyde aerogel, silica aerogel, thermal insulation
Event Title:Leibniz Young Polymer Scientist Forum
Event Location:Aachen
Event Type:international Conference, Workshop
Event Dates:27.-28. Aug. 2014
Organizer:DWI und Evonik Industries
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 - Neuartige Fahrzeugkonzepte und -strukturen (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogele
Deposited By: Laskowski, Jessica
Deposited On:04 Nov 2014 14:54
Last Modified:28 Sep 2015 11:13

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