Determination of NMP residue in PPTA powder by gas chromatography
Polyp-phenyl-phthalyl-p-phenylenediamine(PPTA)polymeric solvent N-methylpyrrolidone(NMP)will partially linger in PPTA products,impacting their quality.The Standard 100 Limited use test list,published by the International Association of Environmental Organizations,explicitly states the maximum amount of residue that can be left over after using NMP.This study used gas chromatography and ultrasonic extraction to ana-lyze the remaining NMP in PPTA powder.The ideal chromatographic conditions were found by examining the col-umn,temperature,flow rate,split ratio,and other factors.The ideal extraction conditions were found by exami-ning the extraction solvent,temperature,time,and sample weight.The established analytical method has demon-strated better than 3.0％reproducibility,5.0％reproducibility,84.81％～103.15％recovery range,and better than 0.000 9％detection limit.These results demonstrate the method's high precision and accuracy,as well as its ability to meet the testing requirements for NMP residue in PPTA powder.
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