Accession Number:

ADA280447

Title:

Basic Solutions to Carbon/Carbon Oxidation: Science and Technology

Descriptive Note:

Annual technical rept. 15 Apr 1993-14 Apr 1994

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK

Report Date:

1994-05-13

Pagination or Media Count:

50.0

Abstract:

The attached report addresses the first year of a program aimed at developing basic solutions to carboncarbon composite oxidation. In particular, one primary thrust is the development of boron containing carbons through pyrolysis of boron containing polymers. Additionally, a basic understanding of the oxidation mechanisms in carbons and boron containing carbons is being sought. Several new boron containing precursors have been synthesized, which can be converted to BC materials after pyrolysis. In particular, polyacrylonitrile PAN has been copolymerized with a boron-containing monomer vinylcatecholborane. Approximately 68 of the original boron is retained after pyrolysis yielding a product with 3.4 boron. 1,4-polybutadiene PBD has been hydroborated to contain large amounts of boron. Model compounds have been used to prepare polydiyne with considerable amounts of boron. In the latter two cases, direct analysis for boron is not yet available. Preliminary TGA data suggests that PBD containing boron results in a more stable structure.

Subject Categories:

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

Distribution Statement:

APPROVED FOR PUBLIC RELEASE