POLYAMIDES AND POLYESTERS FROM FLUORINATED TEREPHTHALIC ACID

Abstract

Polyamides and polyesters were prepared from monofluoroterephthalic acid (T_F) with various diamines or diols. The effect of fluorine substitution in the benzene ring on the synthesis and some properties of these polymers were investigated by comparing with those of the previously reported homologous polymers prepared from terephthalic acid (T) and tetrafluoroterephthalic acid (T_F4).
η_sp/C of polymers from different acids decreases in the order T>T_F>T_F4. T_m measured by DTA decreases in the order T>T_F4>T_F. The crystallinity estimated by DTA peak area and X-ray diffraction intensity curves decreases in the order T>T_F>T_F4. Thermal stability decreases and flame-retardancy and solubility increase with the increase of fluorine content of polymers. These behaviors are also compared with the chlorinated or brominated polymers previously reported.