Accession Number:

AD0692676

Title:

POLY-1,2,4-TRIAZOLES AND POLY-1,3,4-OXADIAZOLES FROM PRECURSOR POLY-N-ACYLHYDRAZIDINES,

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH POLYMER SCIENCES LAB

Personal Author(s):

Report Date:

1969-08-01

Pagination or Media Count:

30.0

Abstract:

High molecular weight soluble poly-N-acylhydrazidine was prepared from low temperature solution polycondensation of 2,6-pyridinediyl dihydrazidine with isophthaloyl chloride. Poly-N-acylhydrazidine was converted hy heating in strong acids such as trifluoroacetic to the corresponding poly-1,3,4-oxadiazole. Whereas, conversion of the precursor poly-N-acylhydrazidine predominantly to poly-1,2,4-triazole was affected by refluxing in solvents such as m-cresol or by solid state advancement at 280 to 350C under an inert atmosphere. The poly-1,2,4-triazole was contaminated with 1.4 to 4.0 1,3,4-oxadiazole depending upon the heating rate. Poly-N-acylhydrazidine was of sufficient molecular weight to cast a clear yellow film which exhibited good flexibility. The film, upon thermal treatment to temperatures as high as 300C, became brittle. The poly-1,3,4-oxadiazole and poly-1,2,4-triazole exhibited thermal decompositions by TGA between 450 and 520C. Prior to polymer synthesis, a series of model compounds were prepared as a guide to polymer synthesis and identification. Author

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE