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Chemische Synthese von Resorcin‐Formaldehyd‐Aerogelkompositen

Laskowski, Jessica (2012) Chemische Synthese von Resorcin‐Formaldehyd‐Aerogelkompositen. Master's, Universität Bonn.

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Abstract

Resorcinol‐formaldehyde‐aerogel‐composites are synthesized and characterized in regard to properties which are interesting for industry. Density, thermal conductivity, specific surface and the compression strength are determined and the structure is investigated by scanning electron microscopy. A standard RF‐recipe are used which contains the molar ratios of resorcinol to formaldehyde (R/F) of 0.7, resorcinol to water (R/W) of 0.04 and resorcinol to catalyst (R/C) of 1500. RF/cellulose‐composites are synthesized by adding cellulose fibers in RF‐solution which fibers are untreated or pretreated with sodium hydroxide to swell or dissolve. Beside RF/cellulose‐composites are synthesized with cellulose‐hydrogel which is immersed into a RF‐solution (with different R/C‐values) while it gels. After aging these composites, the gels are dried supercritical. Furthermore, RF/silica‐composites are synthesized with hydrophobic silica‐aerogels with different grain sizes (1 to 4 mm) by mixing silica with a highly viscous RF‐solution. By employing the same synthesis procedures for RF/Silicacomposites, RF/silica/cellulose‐composites are synthesized with untreated cellulose. All the gels are dried under ambient conditions except the RF/cellulose‐composites with cellulose‐gel.

Document Type:Thesis (Master's)
Title:Chemische Synthese von Resorcin‐Formaldehyd‐Aerogelkompositen
Authors:
AuthorsInstitution or Email of Authors
Laskowski, JessicaUNSPECIFIED
Date:October 2012
Number of Pages:89
Keywords:Aerogele, Resorcin-Formaldehyde, Verbundwerkstoffe
Institution:Universität Bonn
Department:Institut für Anorganische Chemie
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Neuartige Fahrzeugstrukturen (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:31 Oct 2012 12:50
Last Modified:31 Oct 2012 12:50

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