Synthesis and Properties of Rigid-Rod Benzobisazole Polymers Containing Benzothiazole Pendent Groups
Final rept. Oct 1987-Oct 1988
WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
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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.
- Polymer Chemistry