Accession Number:

ADA310639

Title:

Vanadium Oxide/Polypyrrole Aerogel Nanocomposites.

Descriptive Note:

Technical rept. 1 Jun 95-31 May 96,

Corporate Author:

CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

1996-06-18

Pagination or Media Count:

8.0

Abstract:

Vanadium pentoxidepolypyrrole aerogel ARG nanocomposites were prepared by hydrolysis of VOOC3H73 using pyrrolewateracetone mixtures. Monolithic green-black gels with polypyrroleV ratios ranging from 0.15 to 1.0 resulted from simultaneous polymerization of the pyrrole and vanadium alkoxide precursors. Supercritical drying yielded high surface 150-200 sq metersg aerogels, of sufficient mechanical integrity to allow them to be cut without fracturing. TEM studies of the aerogels show that they are comprised of fibers similar to that of V2O5 ARGs, but with a much shorter chain length. Evidence from IR that the inorganic and organic components strongly interact leads us to propose that this impedes the vanadium condensation process. The result is ARGs that exhibit decreased electronic conductivity with increasing polymer content. Despite the unexpected deleterious effect of the conductive polymer on the bulk conductivity, at low polymer content, the nanocomposite materials show enhanced electrochemical properties for Li insertion compared to the pristine aerogel. p1

Subject Categories:

  • Inorganic Chemistry
  • Organic Chemistry
  • Physical Chemistry
  • Polymer Chemistry
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE