Accession Number:

AD0878738

Title:

Approaches to Ladder Structures. 5. Thermal Decomposition and Polymerization of (2H), 3, 1-Benzoxazine-2, 4, (1H)-Dione and Some of Its Derivatives

Descriptive Note:

Technical rept. Nov 1965-Nov 1969

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1970-10-01

Pagination or Media Count:

99.0

Abstract:

A new compound 2H,7H,3,1,8,6-benzobisoxazine-2,4,7,9,1H,6H- tetraone was prepared by reaction of phosgene with 2, 5-diaminoterephthalic acid. The thermal decomposition of 2H,3,1-benzoxazine-2,4,1H-dione was studied as a model reaction. The reaction involves initial loss of carbon dioxide at 360C and the formation of trimeric and tetrameric cyclic aryl amides, followed by dehydration to highly condensed structures. 2H,7H,3,1,8,6- benzobisoxazine-2,4,7,91H,6H tetraone and 6,6-bis-2H,3,1-benzoxazine-2,4, 1H-dione each were decomposed thermally under similar conditions. The resulting products were highly condensed cross-linked polymers of high thermal stability.

Subject Categories:

  • Organic Chemistry
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE