ATR-FTIR method for determining the relative content of two components in PA6/PA66 blends
Polyamide 66(PA66)and PA6 are both widely used engineering plastics.When facing different performance,processing,and cost requirements,nylon 66 is often blended with nylon 6 for application.There are certain difficulties in the subse-quent recycling and modification of the blended material,and a relatively simple method needs to be found to quickly analyze the blending ratio in nylon blends.The differences in peak positions and shapes of PA 6/PA 66 blends with different ratios were analyzed using attenuated total reflection fou-rier transform infrared spectroscopy(ATR-FTIR).The results show that the peak posi-tions and shapes of infrared spectra of blends with different proportions in the range of 1 300-4 000 cm-1 have little correlation with the blending ratio of the blend,while the absorption peak positions at 1 169-1 180 cm-1 have a significant correlation with the varia-tion of blending ratio,which can be used as a criterion for component analysis.The fitting results show that the correlation function of peak position with the increase of PA6 content initially changes smoothly,with a sudden change at positions 1 172 cm-1 to 1 178 cm-1,and subsequent changes decreases,with a correlation coefficient of 0.980 76.Using pre-treated samples for testing,it is found that the difference between the tested and actual blending ratios is about 5%,which can be used as a semi quantitative analysis.This method can quickly perform infrared spectroscopic analysis on unknown PA6/PA66 blend samples to determine the relative propor-tions of PA6 and PA66.
polyamide 6polyamide 66infrared spectrumattenuated total refractionquantitative analysis
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