S. Hsiao, M. He
Dec 1, 2001
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0
Influential Citations
20
Citations
Journal
Macromolecular Chemistry and Physics
Abstract
A series of polyhydrazides and poly(amide hydrazide)s bearing ether and cardo groups were prepared from three bis(ether carboxylic acid)s, 1,1-bis[4-(4-carboxyphenoxy)phenyl]cyclohexane, 5,5bis[4-(4-carboxy-phenoxyl)phenyl]-4,7-methanohexahydroindan and 9,9-bis[4-(4-carboxyphenoxy)phenyl]fluorene, or their diacyl chlorides with terephthalic dihydrazide, isophthalic dihy-drazide and p-aminobenzoyl hydrazide via the phosphory-lation reaction or the low-temperature solution polycon-densation. The resulting hydrazide-containing polymers exhibited inherent viscosities in the range of 0.35-0.71 dL . g -1 . All the hydrazide polymers were found to be amorphous as determined by X-ray diffraction analysis and soluble in many organic polar solvents, and most of them afforded flexible and tough films by solvent casting. The hydrazide polymers had glass transition temperatures (Tg) between 157 and 197°C. All hydrazide polymers could be thermally converted into the corresponding oxadiazole polymers approoximately in the region of 270-370°C, as evidenced by the DSC thermograms. The oxadiazole polymers showed a slightly enhanced crystallinity and an increase of Tg and a dramatically decreased solubility compared to their hydrazide prepolymers. They exhibited Tg's of 218-259°C and showed insignificant weight loss up to 450°C.