Synthesis and properties of cross-linkable poly (aryl ether ketone) oligomers terminated with phthalonitrile group

摘要

Two kinds of phthalonitrile end-capped poly (aryl ether ketone) oligomers (CN-o-PEEK and 2CN-o-PEEK) have been synthesized. The two molecular structures were identified using Fourier transform infrared, nuclear magnetic resonance, and elemental analysis. Hydroxy-containing CN-o-PEEK can be thermal polymerized by duration at 225 degrees C for various times, even in the absence of curing additives. Char yields at 800 degrees C after heat treatment for 60 min were 55%. 2CN-o-PEEK was cured in the presence of p-bis[4-(4-aminophenoxy) phenyl]sulfone via heating its powders up to 275-375 degrees C. The synthesized oligomers have good solubility, whereas the cured samples become insoluble in common organic solvents. The resulting cured samples exhibit no glass transition temperature up to 400 degrees C as measured by differential scanning calorimetry and possess excellent thermal stability.