Premium
Synthesis, thermal properties, and flame retardancy of phosphorus containing polyimides
Author(s) -
Liu YingLing,
Hsiue GingHo,
Lan ChihWein,
Kuo JenKwan,
Jeng RuJong,
Chiu YieShun
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970214)63:7<875::aid-app7>3.0.co;2-n
Subject(s) - thermogravimetric analysis , limiting oxygen index , fire retardant , differential scanning calorimetry , char , thermal decomposition , materials science , phosphorus , thermal stability , polymer , polymer chemistry , pyrolysis , chemical engineering , thermal analysis , decomposition , elemental analysis , chemistry , organic chemistry , thermal , composite material , physics , engineering , metallurgy , thermodynamics , meteorology
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 800°C. Limiting oxygen index values higher than 48 were found for the phosphorylated polyimides. Such properties make these polymers useful in flame retardant applications. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 875–882, 1997