Quantitative analysis of pA66/PA6 blend by pyrolysis gas chromatography-mass spectrometry

Abstract

A pyrolysis gas chromatography-mass spectrometry method using correction factor area normalization was applied for quantitative analysis of the PA66/PA6 blend ratio. The PA66/PA6 blend sample with known proportions was prepared. The pyro grams of the sample were obtained at the pyrolysis temperature of 600°C. The characteristic peaks-cyclopentanone and caprolactam of thermally decomposed polyester were selected as the peak to quantitatively determine the blending ratio. A correction factor of the characteristic ion peak area and corresponding mass was obtained and applied to quantitative analysis of the proportion of PA66/PA6 blends in the actual sample. The known content PA66/PA6 blend samples with different PA66/PA6 bending ratios were measured, the rate of recovery was from 96.5% to 106.4%, and the relative standard deviation (RSD) was from 0.8% to 7.6% (n = 3). The result showed that the Pyrolysis Gas Chromatography-Mass Spectrometry method is simple and convenient, accurate, which is suitable for the analysis of the PA66/PA6 blending ratio in the full range.