Polyterephthalamides with naphthoxy-pendent groups
Journal
Journal of Polymer Science, Part A: Polymer Chemistry
Journal Volume
40
Journal Issue
11
Pages
1781-1789
Date Issued
2002
Author(s)
Hsiao, S.-H.
Abstract
A series of new aromatic polyamides having pendent naphthoxy groups were synthesized by the triphenyl phosphite-activated polycondensation of (2-naphthoxy)terephthalic acid (NOTPA) with various aromatic diamines in a medium consisting of N-methyl-2-pyrrolidone (NMP), pyridine, and calcium chloride. The diacid monomer NOTPA was prepared from the nitro displacement of dimethyl 2-nitroterephthalate with the potassium naphthoxide of β-naphthol, followed by base-induced ester hydrolysis. All the resulting polymers were noncrystalline and readily soluble in aprotic polar solvents such as NMP and N,N-dimethylacetamide. Almost all the polymers could be solution-cast to tough, creasable amorphous films with good mechanical properties, the values of tensile strengths ranging from 90 to 124 MPa with initial moduli ranging from 1.72 to 2.51 GPa. Except for two examples, all the other polyamides displayed discernible glass transitions between 189 and 248 °C in the differential scanning calorimetric traces. These polyamides showed insignificant decomposition below 400 °C in nitrogen or air. © 2002 Wiley Periodicals, Inc. J. Polym. Sci. Part A: Polym. Chem.
SDGs
Type
journal article