✦ LIBER ✦

Synthesis, thermal properties, and flame retardancy of phosphorus containing polyimides

✍ Scribed by Ying-Ling Liu; Ging-Ho Hsiue; Chih-Wein Lan; Jen-Kwan Kuo; Ru-Jong Jeng; Yie-Shun Chiu

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 187 KB
Volume: 63
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19970214)63:7<875::aid-app7>3.0.co;2-n

No coin nor oath required. For personal study only.

✦ Synopsis

Phosphorus containing polyimides were prepared via phosphorylation of organosoluble polyimides. This was achieved by phenoxaphosphine oxide ring formation reaction or esterification with diethylchlorophosphate. The phosphorylation was confirmed by infrared, 31 P nuclear magnetic resonance, and elemental analysis for phosphorus. Polyimides containing phosphorus of 8.3 and 5.4% by weight were found. Thermal characteristics and decomposition behavior of the resulting polyimides were investigated by differential scanning calorimetry and thermogravimetric analysis. Introduction of phosphorus into polyimides slightly reduced their initial weight loss temperatures and led to high char yields at temperatures higher than 800ЊC. Limiting oxygen index values higher than 48 were found for the phosphorylated polyimides. Such properties make these polymers useful in flame retardant applications.

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