Accession Number:

AD0767936

Title:

The Effect of Structure on Carbon Formation in Polyquinoxalines,

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

Report Date:

1973-08-17

Pagination or Media Count:

18.0

Abstract:

Thermogravimetric analysis of polyquinoxaline polymers has provided a great deal of information regarding the relationship between polymer structure and thermal stability. This data has been used to show how bridging groups, pendant phenyl groups, cross-linking, steric factors, and backbone modifications affect carbon retention following pyrolysis. The results indicate, for example, that ether oxygen adversely affects carbon formation and that the resulting carbon yields are inversely proportional to the number of oxygen atoms present. Pendant phenyl groups lower while cross-linking raises carbon yields. In addition, it has been shown that polymers with ortho orientation along the polymer backbone are susceptible to higher weight losses than the corresponding meta and para polymers. Polyphenylquinoxalines which contain amide bonds produced less carbon after pyrolysis than the corresponding imide polymers. Author-PL

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE