Accession Number : AD0475864

Title :   THE THERMAL AND ABLATIVE DEGRADATION OF SOME EPOXY RESINS CURED WITH METHYL BICYCLO(2.2.1)HEPTENE-2,3-DICARBOXYLIC ANHYDRIDE (NMA).

Descriptive Note : Technical rept.,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Fleming, Gerald J.

Report Date : 12 OCT 1965

Pagination or Media Count : 53

Abstract : The unusual two-step thermal degradation mechanism of epoxy resins cured with methyl bicyclo(2.2.1)heptene-2,3-dicarboxylic anhydride (NMA) was of NMA on the final epoxy system's chemical composition, crosslink density, thermal and ablative performance, and mechanism of degradation. Two mechanisms were elucidated for the initiation of thermal degradation of NMA cured epoxy resins. One, an acid-initiated mechanism which results in a splitting out of NMA from the resin structure, is operative up to 350 C. The other, a reverse Diels-Alder mechanism, is operative from 350 C and higher, especially under ablative conditions. (Author)

Descriptors :   *ABLATION), (*EPOXY RESINS, (*PYROLYSIS, EPOXY RESINS), CYCLOALKENES, ANHYDRIDES, CATALYSTS, ADDITIVES, CROSSLINKING(CHEMISTRY), REACTION KINETICS, DEGRADATION, AGING(MATERIALS), INFRARED SPECTRA, CHROMATOGRAPHIC ANALYSIS.

Subject Categories : Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE