Determination of copper, iron, potassium and sodium in polyimide resins by atomic absorption spectrometry

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  • ポリイミド樹脂中銅，鉄，カリウム，ナトリウムの原子吸光分析法による定量
  • ポリイミド ジュシチュウ ドウ テツ カリウム ナトリウム ノ ゲンシ キュウ

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Abstract

Polyimide resins (polyimide-isoindoloquinazolincdione) were decomposed by a dry ashing technique and analyzed for the four elements by flame (air-acetylene) atomic absorption spectrometry. A specially designed quartz ashing vessel was used to control the temperature and atmospheric composition for the ashing. Recoveries of four elements decreased with increasing ashing temperature, being dependent on crucible materials. The recoveries of copper and sodium were not satisfactory when the platinum and quartz crucible were used, respectively. These losses were attributed to the retention of respective metal on the crucible used, which was demonstrated by radioisotopic tracer method. The increase of oxygen content in atmospheric gases resulted in a slight increase of temperature and shortened the ashing time. In practice volatile organic solvent in the resin was first removed by increasing the heating temperature from 100 to 500°C and then the oxidant gases consisting of oxygen and air in equivalent volume was supplied to the ashing vessel at a flow rate of 1.2 l/min. The temperature was raised to 600°C to complete the ashing for one hour. The ash was dissolved in 1 ml of nitric acid and stored in 2 N nitric acid, followed by atomic absorption measurements. The standard deviation of (3.37.9) % came out.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 28 (3), 201-205, 1979

    The Japan Society for Analytical Chemistry

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