| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 95 === In the first part, several new phosphorus-containing polymers with high Tg and Td were successfully synthesized by one-step approach via azomethine structure at room temperature. According to the experimental data, LiCl is crucial to the high molecular weight of new polymers, while p-TSA and pressure only have little effect on molecular weight in the presence of LiCl. The equilibrium of polyazomethine formation shifted to right after Dopo reacted with azomethine, resulting in the molecular weight of polymers by one-step approach is higher than that of polymers by two -step approach. According to the molecular weight, NMR and FT-IR characterization of phosphorus-containing linear polymers, the reaction rate between aldehyde and amine is higher than that of aldehyde and Dopo. Besides, the reaction rate of nucleiphilic addition between Dopo and azomethine is higher than that of Dopo and aldehyde.
In the second part, a series of hyperbranched polyamides were successfully synthesized via polycondensation of dopotriamine and four aromatic diacids in the presence of condensing agents such as triphenyl phosphite and pydrdine. The degrees of branching of hyperbranched polyamides were estimated from 31P NMR spectra, and the degrees of branching were independent of reaction concentration. Hyperbranched polyamides were soluble in amide solvents and HB-IV was even soluble in pyridine.
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