Accession Number:

ADA234742

Title:

Synthesis and Properties of Rigid-Rod Benzobisazole Polymers Containing Benzothiazole Pendent Groups

Descriptive Note:

Final rept. Oct 1987-Oct 1988

Corporate Author:

WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1990-11-16

Pagination or Media Count:

24.0

Abstract:

Novel polybenzobisazoles containing benzothiazole pendents were prepared by the reaction of 2-benzothiazole or 2,5-dibenzothiazole terephthalic acids with the appropriate aminomercapto, aminohydroxy or tetraamino monomers in polyphosphoric acid at elevated temperatures. The polymerizations were carried out at concentrations 10-18 which would promote anistropic reaction mixtures. Intrinsic viscosities in range of 4-19d1g were measured in methanesulfonic acid at 30 C. Thermogravimetric-mass spectral analysis in vacuo showed that the pendent benzothiazole group was the initial product of thermal degradation, maximizing at 590 C. Anisotropic polymerization mixtures could be wet-spun into fiber with modulus values between 25-30 MSI and tenacity values up to 350 KSI.

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE