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Title: Low density, resorcinol-formaldehyde aerogels

The polycondensation of resorcinol with formaldehyde under alkaline conditions results in the formation of surface functionalized polymer "clusters". The covalent crosslinking of these "clusters" produces gels which when processed under supercritical conditions, produce low density, organic aerogels (density .ltoreq.100 mg/cc; cell size .ltoreq.0.1 microns). The aerogels are transparent, dark red in color and consist of interconnected colloidal-like particles with diameters of about 100 .ANG.. These aerogels may be further carbonized to form low density carbon foams with cell size of about 0.1 micron.
Authors:
 [1]
  1. (Pleasant Hill, CA)
Publication Date:
OSTI Identifier:
867129
Report Number(s):
US 4873218
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Country of Publication:
United States
Language:
English
Subject:
density; resorcinol-formaldehyde; aerogels; polycondensation; resorcinol; formaldehyde; alkaline; conditions; results; formation; surface; functionalized; polymer; clusters; covalent; crosslinking; clusters; produces; gels; processed; supercritical; conditions; produce; density; organic; aerogels; density; ltoreq; 100; mg; cc; cell; size; ltoreq; microns; aerogels; transparent; dark; color; consist; interconnected; colloidal-like; particles; diameters; 100; ang; aerogels; carbonized; form; density; carbon; foams; cell; size; micron; supercritical conditions; organic aerogels; carbon foam; cell size; cell size; carbon foams; alkaline condition; organic aerogel; resorcinol-formaldehyde aerogels; density carbon; surface functionalized; functionalized polymer; surface functional; produces gels; alkaline conditions; conditions results; covalent crosslinking /502/521/