The cyclic phosphorous group, 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide‐10‐yl (DOPO), attached on a polyamide PA–DOPO could be hydrated to give its open‐chained form with phosphinic acid groups (PA–DOPO–HD). The open‐chained phosphinic acid groups could be reformed to its cyclic DOPO form through thermal dehydration. The occurrence of the hydration and thermal‐dehydration reactions and the chemical structure of the polyamides were demonstrated with FTIR, 31P NMR, and thermal analysis. PA–DOPO–HD exhibited similar inherent viscosity and better organosolubility than the original polyamide PA–DOPO. Copyright © 2003 Society of Chemical Industry
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Document Type: Research Article
Department of Chemical Engineering and R&D Centre for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 320, Taiwan, ROC
Chung San Institute of Science and Technology, Lungtan, Taoyuan 323, Taiwan, ROC
August 1, 2003
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