Aerogels derived from multifunctional organic monomers
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TLDR
In this article, the chemistry-structure-property relationships of organic aerogels were studied and aqueous polycondensation of resorcinol and melamine with formaldehyde was proposed.Abstract:
Traditional inorganic aerogels are mad via the hydrolysis and condensation of metal alkoxides. Recently, we reported the synthesis of organic aerogels based upon the aqueous polycondensation of (1) resorcinol with formaldehyde and (2) melamine with formaldehyde. The former materials can also be pyrolyzed in an inert atmosphere to form vitreous carbon aerogels. In both the inorganic and organic systems, the structure and properties of the dried aerogel are dictated by polymerization conditions. Factors such as pH, reactant ratio, and temperature influence the crosslinking chemistry and growth processes taking place prior to gelation. The ability to tailor the structure and properties of aerogels at the nanometer scale opens up exciting possibilities for these novel materials. This paper addresses the chemistry-structure-property relationships of organic aerogels. 22 refs., 7 figs.read more
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References
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Journal ArticleDOI
Organic aerogels from the polycondensation of resorcinol with formaldehyde
TL;DR: In this paper, the polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer "clusters" which are processed under supercritical conditions to obtain low density, organic aerogels.
Book ChapterDOI
Better Ceramics Through Chemistry
TL;DR: In this article, the authors apply polymeric network theory to the design of gel ultrastructures and apply scaling calculations based on molecular orbital calculations for prediction of the silanol polymerization mechanism.
Journal ArticleDOI
Structure-property behavior of new hybrid materials incorporating oligomeric species into sol-gel glasses. 3. Effect of acid content, tetraethoxysilane content, and molecular weight of poly(dimethylsiloxane)
TL;DR: Materiau hybride ayant une bonne transparence optique and un comportement mecanique tres different de celui des verres sol-gel purs.
Journal ArticleDOI
Thermal conductivity of monolithic organic aerogels.
TL;DR: Caloric measurements under variation of gas pressure as well as spectral infrared transmission measurements allowed the determination of solid Conductivity, gaseous conductivity, and radiative conductivity as a function of density.
Journal ArticleDOI
Organic aerogels: microstructural dependence of mechanical properties in compression
TL;DR: In this article, the microstructural dependence of the compressive mechanical properties of both resorcinol-formaldehyde and carbon aerogels is examined in detail, and it is shown that these new materials can be pyrolyzed in an inert atmosphere to form vitreous carbon aeroglobels.