Synthesis and Characterization of Poly(ester-ether-imide)s Derived from 5-(4-Trimellitimidophenoxy)-1-trimellitimido naphthalene

摘要

A series of novel aromatic poly(ester-etherimide) s with inherent viscosity values of 0.44–0.74 dL g1 were prepared by the diphenylchlorophosphate-activated direct polycondensation of an imide ring-containing diacid namely 5-(4-trimellitimidophenoxy)-1-trimellitimido naphthalene (1) with various aromatic dihydroxy compounds in the presence of pyridine and lithium chloride. Owing to comparison of the characterization data, an ester-containing model compound (2) was also synthesized by the reaction of 1 with phenol. The model compound 2 and the resulted polymers were fully characterized by FT-IR and NMR spectroscopy. The ultraviolet kmax values of the poly(ester-ether-imide)s were also determined. The resulting polymers exhibited an excellent organosolubility in a variety of high polar solvents such as N,N-dimethylacetamide, N,N-dimethylformamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone. They were soluble even in common less polar organic solvents such as pyridine, m-cresol, and tetrahydrofuran on heating. Crystallinity of the polymers was estimated by means of wide-angle X-ray diffraction. The resulted polymers exhibited nearly an amorphous nature. From differential scanning calorimetry thermograms, the polymers showed glass-transition temperatures between 221 and 245C. Thermal behaviors of the obtained polymers were characterized by thermogravimetric analysis, and the 10% weight loss temperatures of the poly(ester-ether-imide)s were found to be over 410C in nitrogen.