Accession Number : AD0692676

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

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH POLYMER SCIENCES LAB

Personal Author(s) : Hergenrother,Paul M.

Report Date : AUG 1969

Pagination or Media Count : 30

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)

Descriptors :   (*POLYMERS, SYNTHESIS(CHEMISTRY)), (*NITROGEN HETEROCYCLIC COMPOUNDS, POLYMERIZATION), PYRIDINES, DIFFERENTIAL THERMAL ANALYSIS, THERMOGRAVIMETRIC ANALYSIS, HYDRAZINE DERIVATIVES, OXYGEN HETEROCYCLIC COMPOUNDS, NUCLEAR MAGNETIC RESONANCE, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, INFRARED SPECTRA, PHTHALIC ACIDS

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE