Synthesis of Noncrystalline Aromatic Polyamides
Abstract
Noncrystalline thermooxidatively stable aromatic p olyamides were synthesized through the triphenyl phosphite-promoted polycondensations of 3,3-(sulfonylbis(1,4-phenylenoxy)) dibenzoic acid and 3,3(carbonylbis(1,4-phenylenoxy)) dibenzoic acid with 3,3-(1,3-phenylendioxy)dianiline. Alternatively, the polymers could be prepared through the low temperature polydensations in N-methylpyrollidone of the corresponding diacid chlorides with the aromatic diamine. An additional polyamide was synthesized through the self-condensation of 3-(4-(3-aminophenoxybenzoyl)phenoxy) benzoic acid. This previously unreported monomer had been prepared by a two-step reaction sequence from 4,4-difluorobenzophenone. Inherent viscosities in the range of 0.27-0.63 dl/g (N,N-dimethylacetamide, 30C, 0.2 g/d1) were obtained. Polymer structures were established by elemental analyses and infrared spectroscopy. Thermal characterization was carried out by differential scanning colorimetry, thermal gravimetric analysis, and isothermal aging. Keywords: Aromatic polyamide, Thermooxidative stability, Low glass transition temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1988
- Accession Number
- ADA196745
Entities
People
- E. J. Soloski
- R. C. Evers
- Tonson Abraham
Organizations
- Wright Laboratory