Preparation of phosphorus-containing polymers—XVII. Preparation of polyamides containing phenoxaphosphine rings |
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Authors: | M. Sato M. Yokoyama |
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Affiliation: | Department of Industrial Chemistry, Kogakuin University, Nishishinjuku, Shinjuku-ku, Tokyo 160, Japan |
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Abstract: | New phenoxaphosphine-containing polyamides were prepared from 2,8-dichloroformyl-10-phenylphenoxaphosphine 10-oxide (III) and aromatic diamines in DMA by low-temperature solution polycondensation in the presence of triethylamine as acid acceptor. (III) was synthesized by the chlorination of 2,8-dicarboxy-10-phenylphenoxaphosphine 10-oxide derived from 2,8-dimethyl-10-phenylphenoxaphosphine 10-oxide by pyridine-permanganate oxidation. The resulting polyamides had a reduced viscosity of 0.14–0.40 dl/g in DMA or conc. H2SO4 at 30°. They were soluble in conc. H2SO4 and some of them dissolved in DMA, DMF and DMSO, but all were insoluble in benzene and formic acid, etc. They had good thermal stability, hardly degrading until a temperature of about 400° was reached; they showed resistance to ignition. |
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