Summary
The synthesis of cylindrical polyamides by condensation of salts prepared from hexakis(4-carboxyphenoxy)cyclotriphosphazene (2) and diamines was investigated. Among the diamines used, p-xylylenediamine (4) gave the salt (5) composed of 1 : 3 2 – 4. The condensation of 5 at 240 °C for 60 h gave a polyamide (6a) but some carboxyl groups remained without reaction. By adding excess 4 to 5 in a sealed tube, however, polyamide (6b), which showed no significant peak assignable to the carboxyl group in FT-IR and 13C-CPMAS spectra, was obtained. X-ray diffraction studies showed that 6a was amorphous but 6b has a high level of crystalline character. From these results and the structural feature of 2, it appears that 6b takes a three-dimensional cylindrical structure. The thermogravimetric analysis of 6b exhibited that the onset temperature of decomposition was 300 °C under both nitrogen and air atmospheres.
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Received: 29 August 2001/Accepted: 4 October 2001
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Inoue, K., Inoue, Y. Synthesis of cylindrical polyamides from hexakis (4-carboxyphenoxy)cyclotriphosphazene and p-xylyenediamine. Polymer Bulletin 47, 239–245 (2001). https://doi.org/10.1007/s289-001-8177-1
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DOI: https://doi.org/10.1007/s289-001-8177-1