ISSN:
0887-624X
Schlagwort(e):
fluorine-containing polymers
;
aromatic polybenzothiazoles
;
4,4′-(hexafluoroisopropylidene)dibenzoic acid
;
tetrafluoroterephthalic acid
;
2,5-diamino-1,4-benzenedithiol
;
direct polycondensation
;
phosphorus pentoxide/methanesulfonic acid
;
polyphosphoric acid
;
high-temperature soluble polymers
;
liquid crystalline polymer
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Two fluorine-containing aromatic polybenzothiazoles were synthesized by direct polycondensation of 4,4′-(hexafluoroisopropylidene)dibenzoic acid and tetrafluoroterephthalic acid with 2,5-diamino-1,4-benzenedithiol dihydrochloride using phosphorus pentoxide/methanesulfonic acid or polyphosphoric acid as both condensing agent and solvent. The effect of introduction of fluorine atom on the synthesis and properties of these polymers was discussed in detail. The perfluoroisopropylidene unit-containing polybenzothiazole was amorphous, and showed good solubility in organic solvents, excellent mechanical properties, and high thermal stability. The perfluoro-p-phenylene unit-containing polybenzothiazole was crystalline, and exhibited lyotropic behavior in concentrated sulfuric acid. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 429-435, 1998
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
