Physicochemical characterization of some fully aromatic polyamides

Abstract

SynopsisThe characterization of eight fully aromatic polyamides are described with the procedures required to yield film-and fiber-forming materials. Solutions of these aromatic polyamides in dimethylacetamide were characterized by NMR and the effects of dissolved lithium chloride on these spectra investigated. The NMR resonances for specific protons in these polymers are assigned. The I R spectra of thin films and fibers of these polyamides are also reported, together with g l w transition temperatures as measured by differential scanning calorimetry (DSC). The value of NMR and I R to identify specific polyamide homopolymers and copolymers is discussed.

Synthesis of a novel block copolymer containing aromatic polyamide and fluoroethylene segments

“…The peak of the amide bond of the telechelic diamine shifts to the low magnetic field side with respect to that of a conventional aramid. 15 This is due to the presence of CF 2 . The electronegativity of fluorine is higher than that of carbon (4.0 and 2.5, respectively).…”

“…The singlet at 5.20 ppm is attributed to the terminal NH 2 groups, whereas the singlet at 11.06 ppm is attributed to the amide bond NH. The peak of the amide bond of the telechelic diamine shifts to the low magnetic field side with respect to that of a conventional aramid 15. This is due to the presence of CF 2 .…”

Effect of Nonsolvent Additives on the Pore Size and the Pore Size Distribution of Aromatic Polyamide Ro Membranes

“…The polymer (poly-m-phenylene-iso(70)-co-tere(30)-phthalamide, abbreviated as PA hereafter) sample of average molecular weight 31,100 was laboratory Downloaded by [McGill University Library] at 15:48 02 February 2015 synthesized according to the method reported elsewhere (Gan et al, 1975). The viscosity measurement of the polymer was conducted by means of a CannonUbbelohde viscometer; the capillary size was chosen so that the kinetic energy correlations were not necessary.…”

Synthesis of Block Copolymers containing Chain‐Controlled Aramid and Fluoroethylene Segments

“…The singlet at 10.43 ppm is attributed to the amide bonds of the aramid segments and the singlet at 11.08 ppm is attributed to the amide bonds between the fluorocarbon and benzene rings. The peak of the amide bond adjacent to the fluorocarbon group shifts to the low magnetic field side compared to that in the aramid segment 17. This is due to the presence of CF 2 , described in our former report 9.…”